diff --git a/public/contacts.json b/public/contacts.json
index 63297dc..c56b1fc 100644
--- a/public/contacts.json
+++ b/public/contacts.json
@@ -11,6 +11,7 @@
     "linkedinUrl": "https://linkedin.com/in/johnsmith",
     "notes": "Met at React conference 2023",
     "tags": ["developer", "react", "frontend"],
+    "naoStatus": "not_invited",
     "createdAt": "2023-10-01T10:00:00Z",
     "updatedAt": "2023-10-15T14:30:00Z"
   },
@@ -26,6 +27,8 @@
     "linkedinUrl": "https://linkedin.com/in/sarahjohnson",
     "notes": "Potential collaboration on new project",
     "tags": ["product", "startup", "management"],
+    "naoStatus": "member",
+    "joinedAt": "2023-08-15T10:00:00Z",
     "createdAt": "2023-09-15T09:00:00Z",
     "updatedAt": "2023-10-20T16:45:00Z"
   },
@@ -40,6 +43,8 @@
     "profileImage": "https://i.pravatar.cc/150?img=3",
     "notes": "Design consultant for mobile app",
     "tags": ["design", "ux", "mobile"],
+    "naoStatus": "invited",
+    "invitedAt": "2023-12-01T15:30:00Z",
     "createdAt": "2023-08-20T11:30:00Z",
     "updatedAt": "2023-09-10T13:15:00Z"
   },
@@ -55,6 +60,8 @@
     "linkedinUrl": "https://linkedin.com/in/emilyrodriguez",
     "notes": "Former colleague from previous company",
     "tags": ["engineering", "management", "scaling"],
+    "naoStatus": "member",
+    "joinedAt": "2023-07-20T12:00:00Z",
     "createdAt": "2023-07-10T08:00:00Z",
     "updatedAt": "2023-08-25T10:20:00Z"
   },
diff --git a/src/pages/ContactListPage.tsx b/src/pages/ContactListPage.tsx
index 2ef71a3..541f7af 100644
--- a/src/pages/ContactListPage.tsx
+++ b/src/pages/ContactListPage.tsx
@@ -29,7 +29,10 @@ import {
   Group,
   CloudDownload,
   VerifiedUser,
-  Favorite
+  Favorite,
+  CheckCircle,
+  Schedule,
+  Send
 } from '@mui/icons-material';
 import { dataService } from '../services/dataService';
 import type { Contact } from '../types/contact';
@@ -121,6 +124,34 @@ const ContactListPage = () => {
     }).format(date);
   };
 
+  const getNaoStatusIndicator = (contact: Contact) => {
+    switch (contact.naoStatus) {
+      case 'member':
+        return {
+          icon: <CheckCircle sx={{ fontSize: 16 }} />,
+          label: 'NAO Member',
+          color: theme.palette.success.main,
+          bgColor: alpha(theme.palette.success.main, 0.08),
+          borderColor: alpha(theme.palette.success.main, 0.2)
+        };
+      case 'invited':
+        return {
+          icon: <Schedule sx={{ fontSize: 16 }} />,
+          label: 'Invited',
+          color: theme.palette.warning.main,
+          bgColor: alpha(theme.palette.warning.main, 0.08),
+          borderColor: alpha(theme.palette.warning.main, 0.2)
+        };
+      default:
+        return null;
+    }
+  };
+
+  const handleInviteToNao = (contact: Contact) => {
+    // Navigate to invitation page with contact pre-filled
+    navigate(`/invite?inviteeName=${encodeURIComponent(contact.name)}&inviteeEmail=${encodeURIComponent(contact.email)}`);
+  };
+
   return (
     <Box sx={{ height: '100%' }}>
       <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 3 }}>
@@ -293,6 +324,31 @@ const ContactListPage = () => {
                                 }}
                               />
                             )}
+                            
+                            {/* NAO Status Indicator */}
+                            {(() => {
+                              const naoStatus = getNaoStatusIndicator(contact);
+                              return naoStatus ? (
+                                <Chip
+                                  icon={naoStatus.icon}
+                                  label={naoStatus.label}
+                                  size="small"
+                                  variant="outlined"
+                                  sx={{
+                                    fontSize: '0.75rem',
+                                    height: 20,
+                                    borderRadius: 1,
+                                    backgroundColor: naoStatus.bgColor,
+                                    borderColor: naoStatus.borderColor,
+                                    color: naoStatus.color,
+                                    '& .MuiChip-icon': {
+                                      fontSize: 14,
+                                    },
+                                  }}
+                                />
+                              ) : null;
+                            })()}
+                            
                             {/* Vouch and Praise Indicators */}
                             <Chip
                               icon={<VerifiedUser sx={{ fontSize: 14 }} />}
@@ -361,24 +417,48 @@ const ContactListPage = () => {
                           </Typography>
                         </Box>
                         
-                        {/* Select button for selection mode */}
-                        {isSelectionMode && (
-                          <Button
-                            variant="contained"
-                            onClick={(e) => {
-                              e.stopPropagation();
-                              handleSelectContact(contact);
-                            }}
-                            sx={{
-                              borderRadius: 2,
-                              textTransform: 'none',
-                              alignSelf: 'center',
-                              minWidth: 80
-                            }}
-                          >
-                            Select
-                          </Button>
-                        )}
+                        {/* Action buttons */}
+                        <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1, alignSelf: 'center' }}>
+                          {/* Select button for selection mode */}
+                          {isSelectionMode && (
+                            <Button
+                              variant="contained"
+                              onClick={(e) => {
+                                e.stopPropagation();
+                                handleSelectContact(contact);
+                              }}
+                              sx={{
+                                borderRadius: 2,
+                                textTransform: 'none',
+                                minWidth: 80
+                              }}
+                            >
+                              Select
+                            </Button>
+                          )}
+                          
+                          {/* Invite to NAO button for non-members (not in selection mode) */}
+                          {!isSelectionMode && contact.naoStatus === 'not_invited' && (
+                            <Button
+                              variant="outlined"
+                              startIcon={<Send sx={{ fontSize: 16 }} />}
+                              onClick={(e) => {
+                                e.stopPropagation();
+                                handleInviteToNao(contact);
+                              }}
+                              sx={{
+                                borderRadius: 2,
+                                textTransform: 'none',
+                                minWidth: 80,
+                                fontSize: '0.875rem',
+                                py: 0.5,
+                                px: 1.5
+                              }}
+                            >
+                              Invite
+                            </Button>
+                          )}
+                        </Box>
                       </Box>
                     </CardContent>
                   </Card>
diff --git a/src/types/contact.ts b/src/types/contact.ts
index 9aaf70f..0e8cf8e 100644
--- a/src/types/contact.ts
+++ b/src/types/contact.ts
@@ -11,6 +11,9 @@ export interface Contact {
   notes?: string;
   tags?: string[];
   groupIds?: string[];
+  naoStatus?: 'member' | 'invited' | 'not_invited';
+  invitedAt?: Date;
+  joinedAt?: Date;
   createdAt: Date;
   updatedAt: Date;
 }