[bleach]

And the winner is:

http://en.allexperts.com/q/Classic-Film-2786/Multiple-Roles-2.htm

There have been many cases of multiple roles in films over the years. The most parts played award goes to Rolf Leslie, who played 27 parts in “Sixty Years a Queen” (1913).

Then, in descending order you have:
Lupino Lane - 24 parts in “Only Me” (1929).
Joseph Henabery - 14 characters in “Birth of a Nation” (1915).
Robert Hirsch - 12 roles in “No Questions on Saturday” (1964).
Michael Ripper - 9 parts in “What a Crazy World” (1963).
Eddie Murphy - 8 characters in “Nutty Professor II: The Klumps” (2000).
Eddie Murphy - 7 characters in “The Nutty Professor” (1996), Jerry Lewis having only played three characters in the original film in 1963.
Jerry Lewis - 7 characters in “The Family Jewels” (1965).
Peter Sellers - 6 roles in “Let’s Go Crazy” (1951).
Peter Sellers - 6 roles in “Soft Beds, Hard Battles” (1974).
Peter Sellers - 3 roles in “Dr. Strangelove” (1964) Mike Myers - 4 roles in “Austin Powers in Goldmember” (2002).
Terry Thomas - 3 parts in “Arabella” (1969).
Red Skelton - 3 characters in “Watch the Birdy” (1930).

[whence911]

WOW! Some of those folks must have been th entire cast.

Then there is the question: how many actors played the same character in the same movie. I open with Casino Royale, the original version.

[11Bush]

Tony Randall should be on the list at 7. He played seven different parts in the ‘7 Faces of Dr. Lao’.

[BlueLancer]

Peter Sellers played three roles (albeit one role was pretty much over by the time the opening credits were completed) in my all-time favorite Peter Sellers movie: PRISONER OF ZENDA.

Although I have to admit that my favorite characters in that movie were Stuart Wilson as the mercenary, Rupert of Hentzau, and Simon Williams as young Fritz, the aide to General Sapt and Commander of the King's Bodyguard Cavalry.

Also one of my particular favorites as far as a Henry Mancini musical score.