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Answer : The following is the un-installation for PostgreSQL 9.1 installed using the EnterpriseDB installer. You most probably have to replace folder /9.1/ with your version number. If /Library/Postgresql/ doesn't exist then you probably installed PostgreSQL with a different method like homebrew or Postgres.app . To remove the EnterpriseDB One-Click install of PostgreSQL 9.1: Open a terminal window. Terminal is found in: Applications->Utilities->Terminal Run the uninstaller: sudo /Library/PostgreSQL/9.1/uninstall-postgresql.app/Contents/MacOS/installbuilder.sh If you installed with the Postgres Installer, you can do: open /Library/PostgreSQL/9.2/uninstall-postgresql.app It will ask for the administrator password and run the uninstaller. Remove the PostgreSQL and data folders. The Wizard will notify you that these were not removed. sudo rm -rf /Library/PostgreSQL Remove the ini file: sudo rm /etc/postgres-reg.ini Remove the PostgreSQL user using System Preferences -> U...