Filmography23 titles
| Year | Title | Character | Age at release |
|---|---|---|---|
| 2010 | Daniel's LotMovie | Pastor Mahoney | 67 |
| 2000 | Enlisted: The Story of 'M*A*S*H'Movie | Self | 57 |
| 2000 | Altman on His Own TermsMovie | Self | 57 |
| 1998 | Hollywood SquaresSeries | Self - Panelist | 55 |
| 1995 | Behind the WaterfallMovie | Mr. Connors | 52 |
| 1994 | Burke's LawSeries | Patrick Noyes | 51 |
| 1983 | AfterMASHSeries | Radar O'Reilly | 40 |
| 1981 | Making 'M*A*S*H'Movie | Self | 38 |
| 1980 | CasinoMovie | Bill Taylor | 37 |
| 1979 | Tales of the UnexpectedSeries | Harry Flock | 36 |
| 1979 | $weepstake$Series | Roscoe Fuller | 36 |
| 1979 | The Man in the Santa Claus SuitMovie | Bob Willis | 36 |
| 1978 | Fantasy IslandSeries | Richard C. Delaney | 35 |
| 1977 | The Love BoatSeries | Eddie Martin | 34 |
| 1977 | CHiPsSeries | Gary Burghoff (uncredited) | 34 |
| 1976 | Donny & MarieSeries | Self | 33 |
| 1975 | Wonder WomanSeries | Alan | 32 |
| 1974 | Dinah!Series | Self | 31 |
| 1972 | M*A*S*HSeries | Radar O'Reilly | 29 |
| 1971 | B.S. I Love YouMovie | Ted | 28 |
| 1970 | M*A*S*HMovie | Cpl. 'Radar' O'Reilly | 27 |
| 1968 | The Good GuysSeries | — | 25 |
| 1962 | The Merv Griffin ShowSeries | Self | 19 |