Does Iron Man 3 Have a Post-Credit Scene?

Yes, there are extra scenes during, or after, the end credits of Iron Man 3

The credits run for about 10 minutes. There is a montage of clips from all three Iron Man movies, and possibly some behind the scenes stuff.

At the very end of the credits is an EXTRA SCENE that explains why Tony was narrating the film with voice over and gives a message about Tony Stark's future.