Welcome to iPhone Forums, Johnbet1!
How did you get your contacts to the iPhone? If you set up your Gmail account on the iPhone and enabled contacts, that's how to remove them:
You can delete them in your Gmail account. Login through a browser, and remove the contacts you don't need.
Another possibility would be to disable Contacts in your Gmail account in Settings - General - Mail, Contacts, Calendars. This will remove every contact on your iDevice. That done, go to the Contacts app, tap Groups and enable "All iPhone". Then you can start saving contacts to your iPhone.
Hope that helps.