Yes, and Denzel Washington played the part of Malcolm in at least ten movies, but I can’t find any mention anywhere of the first nine of them.
Jackie Chan has been in 126 movies, I would estimate that in at least half of those, he has played essentially the same character (in Two Dragons, he played twins). Many of those characters are even named “Jackie”, at least in the English dubs.
He did play the same guy in a bunch of Police Story movies, though.
He did cameos, but most of the time he was playing a part. In fact that’s an interesting question. Has he ever played himself in a Marvel movie?
Michael Winslow is one of several people who were on all seven Police Academy movies, and he also played the Sgt. Larvelle Jones role elsewhere. IMDb lists 11 total.
Q who supplied Bond with improbable gadgets from Connery to Craig (more than eight movies.) I think I have a winner.
Found it. He’s under Stan the Man, not Stan Lee. So five times as himself in a Marvel movie.
Sorry folks. It slipped by me that Desmond Llewlyn died in 1999. But he played Q in 17 bond movies
Sylvester Stallone has played Rocky Balboa in six movies, and has a seventh, Creed, coming out in November.
Clint Eastwood was Dirty Harry in five films. Alas, he doesn’t seem to be interested in doing more in the series. 
As was mentioned, the late Leonard Nimoy played Spock in 8 Star Trek movies. However, Walter Koenig has also played Chekov in 7 ST movies.
Luchador Mil Máscaras has played himself in 19 films. The first, Los canallas, came out in 1968, and the most recent one, Aztec Revenge, was released this year. He’s had quite a run.
I didn’t know this. This excites me! As a Robert B Parker fan, I like the characters Jesse Stone and Sunny Randall much more so than Spenser.