Turbo Pascal is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is Lazarus, which is both free and Open Source. If that doesn't suit you, our users have ranked eight alternatives to Turbo Pascal and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Turbo Pascal are Free Pascal (Free, Open Source) and GNU Pascal (Free, Open Source).
Lazarus is a cross-platform IDE for the Free Pascal compiler. It tries to offer a Delphi-like programming experience through its own 'Lazarus Component Library' and supporting many platforms like Windows, OSX, Linux, BSD, Android, iOS and more.