Breakfast at Tiffany's Sabrina Roman Holiday Two for the Road Wait Until Dark
I'd be quite surprised if none of the above 5 are remade yet.
Sabrina was, but I'm surprised at even that because it seems like AH is so iconic that no one would attempt to replace her in one of her major parts. A Breakfast at Tiffany's remake would just be such a vanity trip for whatever actress did it. Wait Until Dark may be an exception because that kind of has a separate legacy as a stage play.
Wasn't there a kind of remake of Roman Holiday with Hillary Duff or something playing the president's daughter instead of a princess? That doesn't exactly count, though, since it falls more into the "rip-off" category than remake.