There is only one Batman, and that's Bruce Wayne. However, an awful lot of different actors have played the philanthropist/Caped Crusader over the years. Furthermore, belting out Batman's catchphrase "I'm Batman" has long proved popular with characters in movies and on TV who aren't necessarily wearing a bat mask.
The video archivists at Gorilla Mask have compiled a supercut of "every instance of the iconic catchphrase from the Batman movies, television shows, and cartoons, plus quite a few from non-Batmans." Check it out below.