diff --git a/docs/src/commands/build.md b/docs/src/commands/build.md
index 00ab2e9..8058e18 100644
--- a/docs/src/commands/build.md
+++ b/docs/src/commands/build.md
@@ -32,6 +32,16 @@ wasm-pack build --out-dir out
 The above command will put your build artifacts in a directory called `out`, instead
 of the default `pkg`.
 
+## Output file names
+
+Set output file names. Defaults to package name.
+
+```
+wasm-pack build --out-name index
+```
+
+This command will build the package with file names like `index.js`, `index.d.ts`, and so on.
+
 ## Profile
 
 The `build` command accepts an optional profile argument: one of `--dev`,
diff --git a/src/bindgen.rs b/src/bindgen.rs
index bf30d78..9caf1f3 100644
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@@ -173,6 +173,7 @@ pub fn wasm_bindgen_build(
     data: &CrateData,
     bindgen: &Download,
     out_dir: &Path,
+    out_name: &Option<String>,
     disable_dts: bool,
     target: &Target,
     profile: BuildProfile,
@@ -210,6 +211,10 @@ pub fn wasm_bindgen_build(
         .arg(dts_arg)
         .arg(target_arg);
 
+    if let Some(value) = out_name {
+        cmd.arg("--out-name").arg(value);
+    }
+
     let profile = data.configured_profile(profile);
     if profile.wasm_bindgen_debug_js_glue() {
         cmd.arg("--debug");
diff --git a/src/command/build.rs b/src/command/build.rs
index 924ef8e..af1926b 100644
--- a/src/command/build.rs
+++ b/src/command/build.rs
@@ -28,6 +28,7 @@ pub struct Build {
     pub profile: BuildProfile,
     pub mode: BuildMode,
     pub out_dir: PathBuf,
+    pub out_name: Option<String>,
     pub bindgen: Option<Download>,
     pub cache: Cache,
     pub extra_options: Vec<String>,
@@ -159,6 +160,10 @@ pub struct BuildOptions {
     /// Sets the output directory with a relative path.
     pub out_dir: String,
 
+    #[structopt(long = "out-name")]
+    /// Sets the output file names. Defaults to package name.
+    pub out_name: Option<String>,
+
     #[structopt(last = true)]
     /// List of extra options to pass to `cargo build`
     pub extra_options: Vec<String>,
@@ -177,6 +182,7 @@ impl Default for BuildOptions {
             release: false,
             profiling: false,
             out_dir: String::new(),
+            out_name: None,
             extra_options: Vec::new(),
         }
     }
@@ -188,7 +194,7 @@ impl Build {
     /// Construct a build command from the given options.
     pub fn try_from_opts(build_opts: BuildOptions) -> Result<Self, Error> {
         let crate_path = set_crate_path(build_opts.path)?;
-        let crate_data = manifest::CrateData::new(&crate_path)?;
+        let crate_data = manifest::CrateData::new(&crate_path, build_opts.out_name.clone())?;
         let out_dir = crate_path.join(PathBuf::from(build_opts.out_dir));
 
         let dev = build_opts.dev || build_opts.debug;
@@ -210,6 +216,7 @@ impl Build {
             profile,
             mode: build_opts.mode,
             out_dir,
+            out_name: build_opts.out_name,
             bindgen: None,
             cache: cache::get_wasm_pack_cache()?,
             extra_options: build_opts.extra_options,
@@ -388,6 +395,7 @@ impl Build {
             &self.crate_data,
             self.bindgen.as_ref().unwrap(),
             &self.out_dir,
+            &self.out_name,
             self.disable_dts,
             &self.target,
             self.profile,
diff --git a/src/command/test.rs b/src/command/test.rs
index 67436aa..78d8e78 100644
--- a/src/command/test.rs
+++ b/src/command/test.rs
@@ -120,7 +120,7 @@ impl Test {
         } = test_opts;
 
         let crate_path = set_crate_path(path)?;
-        let crate_data = manifest::CrateData::new(&crate_path)?;
+        let crate_data = manifest::CrateData::new(&crate_path, None)?;
         let any_browser = chrome || firefox || safari;
 
         if !node && !any_browser {
diff --git a/src/manifest/mod.rs b/src/manifest/mod.rs
index 617af86..3dfb612 100644
--- a/src/manifest/mod.rs
+++ b/src/manifest/mod.rs
@@ -27,6 +27,7 @@ pub struct CrateData {
     data: Metadata,
     current_idx: usize,
     manifest: CargoManifest,
+    out_name: Option<String>,
 }
 
 #[doc(hidden)]
@@ -214,7 +215,7 @@ pub struct ManifestAndUnsedKeys {
 impl CrateData {
     /// Reads all metadata for the crate whose manifest is inside the directory
     /// specified by `path`.
-    pub fn new(crate_path: &Path) -> Result<CrateData, Error> {
+    pub fn new(crate_path: &Path, out_name: Option<String>) -> Result<CrateData, Error> {
         let manifest_path = crate_path.join("Cargo.toml");
         if !manifest_path.is_file() {
             bail!(
@@ -241,6 +242,7 @@ impl CrateData {
             data,
             manifest,
             current_idx,
+            out_name,
         });
 
         fn error_chain_to_failure(err: cargo_metadata::Error) -> Error {
@@ -346,6 +348,14 @@ impl CrateData {
         }
     }
 
+    /// Get the prefix for output file names
+    fn name_prefix(&self) -> String {
+        match &self.out_name {
+            Some(value) => value.clone(),
+            None => self.crate_name(),
+        }
+    }
+
     /// Get the license for the crate at the given path.
     pub fn crate_license(&self) -> &Option<String> {
         &self.manifest.package.license
@@ -396,14 +406,14 @@ impl CrateData {
         disable_dts: bool,
         out_dir: &Path,
     ) -> NpmData {
-        let crate_name = self.crate_name();
-        let wasm_file = format!("{}_bg.wasm", crate_name);
-        let js_file = format!("{}.js", crate_name);
+        let name_prefix = self.name_prefix();
+        let wasm_file = format!("{}_bg.wasm", name_prefix);
+        let js_file = format!("{}.js", name_prefix);
         let mut files = vec![wasm_file];
 
         files.push(js_file.clone());
         if include_commonjs_shim {
-            let js_bg_file = format!("{}_bg.js", crate_name);
+            let js_bg_file = format!("{}_bg.js", name_prefix);
             files.push(js_bg_file.to_string());
         }
 
@@ -414,7 +424,7 @@ impl CrateData {
         };
 
         let dts_file = if !disable_dts {
-            let file = format!("{}.d.ts", crate_name);
+            let file = format!("{}.d.ts", name_prefix);
             files.push(file.to_string());
             Some(file)
         } else {
diff --git a/tests/all/license.rs b/tests/all/license.rs
index f56f650..cffa799 100644
--- a/tests/all/license.rs
+++ b/tests/all/license.rs
@@ -12,7 +12,7 @@ fn it_copies_a_license_default_path() {
     let fixture = fixture::single_license();
     let out_dir = fixture.path.join("pkg");
     fs::create_dir(&out_dir).expect("should create pkg directory OK");
-    let crate_data = CrateData::new(&fixture.path);
+    let crate_data = CrateData::new(&fixture.path, None);
 
     assert!(license::copy_from_crate(&crate_data.unwrap(), &fixture.path, &out_dir).is_ok());
 
@@ -37,7 +37,7 @@ fn it_copies_a_license_provided_path() {
     let fixture = fixture::single_license();
     let out_dir = fixture.path.join("pkg");
     fs::create_dir(&out_dir).expect("should create pkg directory OK");
-    let crate_data = CrateData::new(&fixture.path);
+    let crate_data = CrateData::new(&fixture.path, None);
 
     assert!(license::copy_from_crate(&crate_data.unwrap(), &fixture.path, &out_dir).is_ok());
     let crate_license_path = fixture.path.join("LICENSE");
@@ -60,7 +60,7 @@ fn it_copies_all_licenses_default_path() {
     let fixture = fixture::dual_license();
     let out_dir = fixture.path.join("pkg");
     fs::create_dir(&out_dir).expect("should create pkg directory OK");
-    let crate_data = CrateData::new(&fixture.path);
+    let crate_data = CrateData::new(&fixture.path, None);
 
     assert!(license::copy_from_crate(&crate_data.unwrap(), &fixture.path, &out_dir).is_ok());
 
@@ -95,7 +95,7 @@ fn it_copies_all_licenses_provided_path() {
     let fixture = fixture::dual_license();
     let out_dir = fixture.path.join("pkg");
     fs::create_dir(&out_dir).expect("should create pkg directory OK");
-    let crate_data = CrateData::new(&fixture.path);
+    let crate_data = CrateData::new(&fixture.path, None);
 
     assert!(license::copy_from_crate(&crate_data.unwrap(), &fixture.path, &out_dir).is_ok());
 
@@ -131,7 +131,7 @@ fn it_copies_a_non_standard_license_provided_path() {
     let fixture = fixture::non_standard_license(license_file);
     let out_dir = fixture.path.join("pkg");
     fs::create_dir(&out_dir).expect("should create pkg directory OK");
-    let crate_data = CrateData::new(&fixture.path);
+    let crate_data = CrateData::new(&fixture.path, None);
 
     assert!(license::copy_from_crate(&crate_data.unwrap(), &fixture.path, &out_dir).is_ok());
 
diff --git a/tests/all/lockfile.rs b/tests/all/lockfile.rs
index 87e4434..1a42ce8 100644
--- a/tests/all/lockfile.rs
+++ b/tests/all/lockfile.rs
@@ -6,7 +6,7 @@ use wasm_pack::manifest::CrateData;
 fn it_gets_wasm_bindgen_version() {
     let fixture = fixture::js_hello_world();
     fixture.cargo_check();
-    let data = CrateData::new(&fixture.path).unwrap();
+    let data = CrateData::new(&fixture.path, None).unwrap();
     let lock = Lockfile::new(&data).unwrap();
     assert_eq!(lock.wasm_bindgen_version(), Some("0.2.37"),);
 }
@@ -15,7 +15,7 @@ fn it_gets_wasm_bindgen_version() {
 fn it_gets_wasm_bindgen_test_version() {
     let fixture = fixture::wbg_test_node();
     fixture.cargo_check();
-    let data = CrateData::new(&fixture.path).unwrap();
+    let data = CrateData::new(&fixture.path, None).unwrap();
     let lock = Lockfile::new(&data).unwrap();
     assert_eq!(lock.wasm_bindgen_test_version(), Some("0.2.37"),);
 }
@@ -60,7 +60,7 @@ fn it_gets_wasm_bindgen_version_in_crate_inside_workspace() {
             "#,
         );
     fixture.cargo_check();
-    let data = CrateData::new(&fixture.path.join("blah")).unwrap();
+    let data = CrateData::new(&fixture.path.join("blah"), None).unwrap();
     let lock = Lockfile::new(&data).unwrap();
     assert_eq!(lock.wasm_bindgen_version(), Some("0.2.37"),);
 }
@@ -128,7 +128,7 @@ fn it_gets_wasm_bindgen_version_from_dependencies() {
             "#,
         );
     fixture.cargo_check();
-    let data = CrateData::new(&fixture.path.join("parent")).unwrap();
+    let data = CrateData::new(&fixture.path.join("parent"), None).unwrap();
     let lock = Lockfile::new(&data).unwrap();
     assert_eq!(lock.wasm_bindgen_version(), Some("0.2.37"),);
 }
diff --git a/tests/all/manifest.rs b/tests/all/manifest.rs
index a68cf27..31ef3ab 100644
--- a/tests/all/manifest.rs
+++ b/tests/all/manifest.rs
@@ -9,7 +9,7 @@ use wasm_pack::{self, license, manifest};
 #[test]
 fn it_gets_the_crate_name_default_path() {
     let path = &PathBuf::from(".");
-    let crate_data = manifest::CrateData::new(&path).unwrap();
+    let crate_data = manifest::CrateData::new(&path, None).unwrap();
     let name = crate_data.crate_name();
     assert_eq!(name, "wasm_pack");
 }
@@ -17,7 +17,7 @@ fn it_gets_the_crate_name_default_path() {
 #[test]
 fn it_gets_the_crate_name_provided_path() {
     let fixture = fixture::js_hello_world();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     assert_eq!(crate_data.crate_name(), "js_hello_world");
 }
 
@@ -26,7 +26,7 @@ fn it_checks_has_cdylib_default_path() {
     let fixture = fixture::no_cdylib();
     // Ensure that there is a `Cargo.lock`.
     fixture.cargo_check();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     assert!(crate_data.check_crate_config().is_err());
 }
 
@@ -35,14 +35,14 @@ fn it_checks_has_cdylib_provided_path() {
     let fixture = fixture::js_hello_world();
     // Ensure that there is a `Cargo.lock`.
     fixture.cargo_check();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     crate_data.check_crate_config().unwrap();
 }
 
 #[test]
 fn it_checks_has_cdylib_wrong_crate_type() {
     let fixture = fixture::bad_cargo_toml();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     assert!(crate_data.check_crate_config().is_err());
 }
 
@@ -51,7 +51,7 @@ fn it_recognizes_a_map_during_depcheck() {
     let fixture = fixture::serde_feature();
     // Ensure that there is a `Cargo.lock`.
     fixture.cargo_check();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     crate_data.check_crate_config().unwrap();
 }
 
@@ -59,7 +59,7 @@ fn it_recognizes_a_map_during_depcheck() {
 fn it_creates_a_package_json_default_path() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, false, &Target::Bundler)
@@ -94,7 +94,7 @@ fn it_creates_a_package_json_default_path() {
 fn it_creates_a_package_json_provided_path() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, false, &Target::Bundler)
@@ -122,7 +122,7 @@ fn it_creates_a_package_json_provided_path() {
 fn it_creates_a_package_json_provided_path_with_scope() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &Some("test".to_string()), false, &Target::Bundler,)
@@ -150,7 +150,7 @@ fn it_creates_a_package_json_provided_path_with_scope() {
 fn it_creates_a_pkg_json_with_correct_files_on_node() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, false, &Target::Nodejs)
@@ -185,7 +185,7 @@ fn it_creates_a_pkg_json_with_correct_files_on_node() {
 fn it_creates_a_pkg_json_with_correct_files_on_nomodules() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, false, &Target::NoModules)
@@ -219,7 +219,7 @@ fn it_creates_a_pkg_json_with_correct_files_on_nomodules() {
 fn it_creates_a_pkg_json_in_out_dir() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("./custom/out");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, false, &Target::Bundler)
@@ -234,7 +234,7 @@ fn it_creates_a_pkg_json_in_out_dir() {
 fn it_creates_a_package_json_with_correct_keys_when_types_are_skipped() {
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     assert!(crate_data
         .write_package_json(&out_dir, &None, true, &Target::Bundler)
@@ -262,7 +262,7 @@ fn it_creates_a_package_json_with_correct_keys_when_types_are_skipped() {
 #[test]
 fn it_errors_when_wasm_bindgen_is_not_declared() {
     let fixture = fixture::bad_cargo_toml();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     assert!(crate_data.check_crate_config().is_err());
 }
 
@@ -294,7 +294,7 @@ fn it_sets_homepage_field_if_available_in_cargo_toml() {
     );
 
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
 
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     crate_data
@@ -310,7 +310,7 @@ fn it_sets_homepage_field_if_available_in_cargo_toml() {
     // When 'homepage' is unavailable
     let fixture = fixture::js_hello_world();
     let out_dir = fixture.path.join("pkg");
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
 
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     crate_data
@@ -326,7 +326,7 @@ fn it_does_not_error_when_wasm_bindgen_is_declared() {
     let fixture = fixture::js_hello_world();
     // Ensure that there is a `Cargo.lock`.
     fixture.cargo_check();
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
     crate_data.check_crate_config().unwrap();
 }
 
@@ -410,7 +410,7 @@ fn it_lists_license_files_in_files_field_of_package_json() {
     let fixture = fixture::dual_license();
     let out_dir = fixture.path.join("pkg");
 
-    let crate_data = manifest::CrateData::new(&fixture.path).unwrap();
+    let crate_data = manifest::CrateData::new(&fixture.path, None).unwrap();
 
     wasm_pack::command::utils::create_pkg_dir(&out_dir).unwrap();
     license::copy_from_crate(&crate_data, &fixture.path, &out_dir).unwrap();