According to TVGuide.com, Owen Wilson's entire part is considered a cameo.

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Question: Why isn't Owen Wilson's name in the credits of Night at the Museum? Is he ashamed of being in it? — Sue

FlickChick: Owen Wilson is a good friend of Ben Stiller, star of Night at the Museum. He agreed to do an unbilled cameo in his friend's film. Actors will often go uncredited when they're doing a tiny part, because there's no way that can get the billing they would normally be accorded. (For a quick overview of the politics of billing, please check out this FlickChick column from 2005.) In any event, during test screenings Wilson's character — a miniature cowboy — tested so well with audiences that the filmmakers went back and scraped together enough footage to expand his part into a real role. The absence of credit has nothing to do with shame or embarrassment — the average actor has neither anyway.

Quoting Agrare:

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Is a cameo always uncredited?

Generally, but not always unfortunately. I have seen some cameos credited - I just can't think of any at the moment!

Quoting skipnet50:

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You would have to ask the filmmaker's that one. But i suspect it's like any other movie, they are called extras. If you are famiuliar with a James Garner film "Tank", I was an extra in the crowd scene at the end of that movie, there were some three hundred of us as I recall, we were paid a small sum and none of us were credited.

Skip

So Skip, did you edit the Tank profile and add yourself (uncredited)?  Of course, we require copious documentation and can't take your word that just because it was YOU and you were THERE... 

Quoting skipnet50:

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First you would have to define cameo. I think simply using (uncrediited) is probably the best answer.
@cmae if you recognized Cedriic then why not provide a time stamp and list him, sound like an interesting piece of data to me.

Skip

I agree on both of your points Skip

Sometimes an actor asks that he not be credited in a film.  Maybe he got into some contractual dispute with the production company or director (i.e., "creative differences") but there was too much significant film shot to simply cut him out of the movie.  Maybe he didn't like the final production and didn't want his name associated with it.  "Alan Smithee" used to be an alias used for a director when the real director wanted to have his name removed from a film, but I don't know of any similar alias for performers.

For example, Robert Forster played Turk in The Lady in Red (the 1979 film about the woman who set John Dillinger up to be captured/killed.)  IMDB lists it as a cameo, but if I recall the film, Forster's character was no mere cameo.  I don't recall why he didn't get credited (if I ever knew).