McLean Stevenson played Lt. Colonel Henry Blake in 70 episodes 1972-1975.
Harry Morgan played Colonel Sherman T. Potter in 180 episodes 1975-1983.
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B.J. Hunnicutt was played by Mike Farrell.
Donald Sutherland played Benjamin "Hawkeye" Pierce in the Movie "MASH" Alan Alda played Hawkeye in the TV series.
Alan Alda played Hawkeye Pierce in the tv series, in the film the role was played was Donald Sutherland.
Loretta Swit in the television series. Sally Kellerman in the movie.
If you are talking about the TV series then it would be Alan Alda.