Tomado de: http://forums.enterprisedb.com/posts/list/1437.page In Mac OSX: (Assuming Default Locations) Via uninstaller: 1) In the installation directory, there will be a uninstall-postgresql.app file will be there, executing (double clicking) that will uninstall the postgresql installation. Manual Uninstallation: 1) Stop the server sudo /sbin/SystemStarter stop postgresql-8.3 2) Remove menu shortcuts: sudo rm -rf /Applications/PostgreSQL 8.3 3) Remove the ini file sudo rm -rf /etc/postgres-reg.ini 4) Removing Startup Items sudo rm -rf /Library/StartupItems/postgresql-8.3 5) Remove the data and installed files sudo rm -rf /Library/PostgreSQL/8.3 6) Delete the user postgres sudo dscl . delete /users/postgres