The new handset is the premium version of the iPhone 11, which Apple revealed just before.
The company said that its improved screen as well as new colours justify the "pro" moniker, which has only ever been used on bigger devices.
"This is the first phone that we've called pro," said Apple's Phil Schiller, as he unveiled the phone.
"For us that means it's the first device that pros can count on to get work done. But it's also a device for all of us who want the best product made, even if we're not a pro."
The new phone comes in a number of colours, including a brand new green.