Beneath the version from the movie by Johnny Mandel there were also some Cover versions of the song. The original version reached number 1 on the UK charts on Mai 31, 1980 and stayed there for 3 weeks. Here is a list of the versions I know of, without claim on completeness and correctness...

Cover Versions
	101 Strings Orchestra Movie & TV Themes (Album) Track 9: Theme from M*A*S*H (Suicide Is Painless) 3:04 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Strings for Lovers (Album) Disc 1, Track 10: Theme from Mash 3:05 (Barnes & Noble) Buy it at: BarnesAndNoble.com 1997 Stage & Screen (Album) Track 19: Theme from M*A*S*H (Suicide Is Painless) 3:06 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 After Five Jazz Expressions (Album) Track 11: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1992 Ahmad Jamal Night Song (Album) Track 7: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1980 1994 Digital Works (Album) Track 9: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1985 1990 Al De Lory Al De Lory Plays Song From M*A*S*H (LP) Track ?: Theme from M*A*S*H (Suicide Is Painless)     1970 Lost Hits of the 70's (Sampler) Track 7: Theme from M*A*S*H (Suicide Is Painless) 2:33   Buy it at: Amazon.de, Amazon.com 1998 Hard to Find Orchestral Instrumentals (Sampler) Track 17: Theme from M*A*S*H (Suicide Is Painless) 2:31 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 Big Joe Rumble Suicide Is Painless (CD-Single) Buy it at: Amazon.com 1998 Bill Evans / Bill Evans Trio You Must Believe in Spring (Album) 1977 Live in Buenos Aires (Album) Track 7: Theme from M.A.S.H. 5:00   Buy it at: Amazon.de 1979 1998 You Must Believe in Spring (Album) Track 7: Theme from M*A*S*H (Suicide Is Painless) 5:53 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1990 Turn Out the Stars: Final Village Vanguard Recordings (Album 8CD) Disc 3, Track 5: Song from M*a*s*h (Suicide Is Painless) 4:07   (Barnes & Noble)   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Homecoming [Live At Southeastern Luisiana University] (Album) Track 4: Theme from M*A*S*H (Suicide Is Painless) 4:11 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1999 Consecration III [JP-IMPORT] (Album) Track 4: Theme from M*A*S*H     Buy it at: Amazon.de, Amazon.com 2000 Bill Evans (Album 3CD) Disc 1, Track 4: Theme from M*A*S*H (Suicide Is Painless) 4:22   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2000 Les Incontournables: Poète d'lart pianistique (Album) Track 1: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 2000 Consecration: The Final Recordings [Milestone] (Album 8CD) Disc 1, Track 9: Song from M*a*s*h (Suicide Is Painless) 4:27 Disc 4, Track 4: Song from M*a*s*h (Suicide Is Painless) 5:03 Disc 7, Track 5: Song from M*a*s*h (Suicide Is Painless) 4:17 Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2002 Getting Sentimental (Album) Track 9: Theme from M*A*S*H (Suicide Is Painless) 4:51 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2003 You Must Believe in Spring [+Bonus Tracks] (Album) Track 7: Theme from M*A*S*H (Suicide Is Painless) 6:02 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2004 Bobby Hutcherson Blue Movies: Scoring For The Studios (Sampler) Track 16: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1997 1999 The Best Smooth Jazz... Ever! (Sampler) Disc 3, Track 14: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 2003 Bronn Journey Life Is Beautiful (Album) Track 5: Theme from M*A*S*H     Buy it at: Amazon.com 2001 Cal Tjader The Shining Sea (Album) Track 9: Song from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1981 1990 Both Sides of the Coin (Album) Disc 2, Track 8: Song from M*A*S*H (Suicide Is Painless) 4:33 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2001 Chuck Loeb Jazz for Couch Potatoes (Sampler) Track 11: M*A*S*H* 5:22 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2004 Crouch End Festival Chorus Hollywood Goes to War [Silva] [SOUNDTRACK] (Sampler) Disc 2, Track 11: Theme from M*A*S*H (Suicide Is Painless) 3:07 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2000 Golden State Orchestra & Singers TV & Broadway's Greatest Hits (Sampler) Disc 2, Track 3: Theme from M*A*S*H (Suicide Is Painless) 3:33   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Graham Dalby & Grahamophones Let's Dance, Vol. 2 (Sampler) Track 6: Theme from M*A*S*H (Suicide Is Painless) 2:26 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Let's Dance the Latin American (Sampler) Track 15: Theme from M*A*S*H (Suicide Is Painless) 2:26 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Hollywood Chamber Symphony Mozart TV (Sampler) Track 3: M*A*S*H (Suicide is Painless) in the style of Mozart 4:25 (Amazon.com) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1997 Jamie Mandel This Is...Son of Cult Fiction (Sampler) Track 21: Suicide Is Painless {M*a*s*h} 2:51   Buy it at: Alpha-music.de, Amazon.de, Amazon.co.uk 1997 J. J. Johanson / Nate Adderly Les Inrockuptibles présentent Un automne 97 (Sampler) Track 1: Suicide is painless 3:28   1997 Chain Reaction: Yokohama Concert, Vol. 2 (Album) Track 3: Theme from M*A*S*H (Suicide Is Painless) 5:06 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2002 Jimmy Smith Off The Top (Album) Track 5: Theme from M*A*S*H (Suicide Is Painless) 6:13 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1982 1990 2003 Joanie Pallatto & Marshall Vente Off The Top (Album) Track 16: Song from M*A*S*H (Suicide Is Painless) 4:06 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1997 Joe Locke Sound Tracks (Album) Track 2: Theme from M*A*S*H (Suicide Is Painless) 7:03 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1997 Music From The Motion Picture: Black Toucan Down (Sampler) Track 3: Suicide Is Painless 7:03   2002 Kenny Drew Jr. This One's for Bill (Album) Track 3: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1999 Lady & Bird (Keren Ann & Bardi Johannsson) Lady & Bird (Album) Track 5: Suicide Is Painless 7:03   Buy it at: Alpha-music.de, Amazon.de 2003 London Pops Orchestra Instrumental Gold: 70's (Album) Track 3: Theme from M*A*S*H (Suicide Is Painless) 2:39 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1994 14 Award Winning Movie Themes of the 70's (Album) Track 3: Theme from M*A*S*H (Suicide Is Painless) 2:38 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1994 Instrumental Gold (Album 3CD) Disc 3, Track 3: Theme from M*A*S*H (Suicide Is Painless) 2:39 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 Manic Street Preachers Ruby Trax: The NME's Roaring 40 (Sampler) Disc 3, Track 14: Suicide Is Painless 3:40   1992 Theme From M.A.S.H. (Suicide Is Painless) (Single) Track 1: Theme From M.A.S.H. (Suicide Is Painless) 3:40   1992 File Under X (Sampler) Track 2: Suicide Is Painless     Buy it at: Amazon.de, Amazon.com 1996 Theme From M.A.S.H. (Suicide Is Painless) [Japan Import] (Maxi CD) Track 1: Theme from M*A*S*H (Suicide Is Painless) 3:40   Buy it at: Amazon.de, Amazon.com 1997 Forever Delayed (Album) Track 17: Suicide Is Painless {Theme from Mash} 3:29   Buy it at: Amazon.de, Amazon.com 2002 Forever Delayed [+ Remixes] (Album 2CD) Disc 1, Track 17: Suicide Is Painless {Theme from Mash} 3:29 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2002 Forever Delayed (DVD) Track 9: Theivie From Mash (Suicide Is Painless)     Buy it at: Alpha-music.de, Amazon.de 2002 Anatomie 2 [Soundtrack] (Sampler) Track 4: Theme From Mash (Suicide Is Painless)   (Amazon.de) Buy it at: Amazon.de 2003 Marc Copland / Dieter Ilg Two Way Street (Album) Track 7: Theme from M*A*S*H (Suicide Is Painless) 6:25 (Barnes & Noble) Buy it at: Amazon.de, BarnesAndNoble.com 1993 Marilyn Manson Blair Witch 2: Book of Shadows [Soundtrack] (Sampler) Track 7: Suicide Is Painless 3:46 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2000 SM.ART Technology (Album) Track 8: Suicide Is Painless   2001 BEST 2002 'TAINTED LOVE' (Album) Track 8: Suicide Is Painless 3:46 2002 Tainted Love (Maxi CD) Track 3: Suicide Is Painless 3:46   Buy it at: Alpha-music.de, Amazon.de, Amazon.com 2002 Tainted Love 2 (Maxi CD) Track 2: Suicide Is Painless 3:46   Buy it at: Amazon.de, Amazon.com 2002 Midnight Blue Inner City Blues (Album) Track 7: Suicide Is Painless 6:33 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2002 Necro-Tonz Are You Dead Yet (Album) Track 5: Theme from M*A*S*H (Suicide Is Painless)   (Amazon.com) Buy it at: Amazon.de, Amazon.com 1999 Paul Desmond Pure Desmond (Album) Track 9: Theme from M*A*S*H (Suicide Is Painless)   (TowerRecords.co.uk) Buy it at: Amazon.de, Amazon.com 1974 1995 Ronnie Mathews Dark Before the Dawn (Album) Track 4: Theme from M*A*S*H (Suicide Is Painless) 6:17   Buy it at: BarnesAndNoble.com 1990 Dark Before the Dawn [Japan Import] (Album) Track 4: Theme from M*A*S*H (Suicide Is Painless) 6:17   Buy it at: Amazon.de, Amazon.com 1994 Once I Love (Album) Track 6: Theme {From Mash} 8:28   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2003 Royal Trux Singles, Live, Unreleased (Album) Disc 2, Track 8: Suicide Is Painless 3:46   Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 1997 Stars on 45 The Very Best of Stars on 45 (Album) Track 6: Star Wars and Other Hits: Star Wars / Can't Give You Anything / ... [Main Title] 5:17   Buy it at: Alpha-music.de, Amazon.de, Amazon.com 1995 Greatest Stars on 45, Vol. 1 (Album) Track 6: Star Wars and Other Hits: Star Wars / Can't Give You Anything / ... [Main Title] 5:17   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 2000 2002 The Very Best of Stars on 45 (Album) Track 5: Star Wars and Other Hits: Star Wars / Can't Give You Anything / ... [Main Title] 5:17   Buy it at: Amazon.de, Amazon.com 2002 Sue Raney / Bob Florence Group Quiety There (Album) Track 10: Theme from M*A*S*H (Suicide Is Painless)   Buy it at: Amazon.de, Amazon.com 1993 Another Side (Album) Track 6: My Friend, John: The Song from M*A*S*H (Suicide Is Painless) 5:55   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2001 Swiss Ballroom Orchestra Ballroom Dance Music [BOX SET] Disc 2, Track 12: Suicide Is Painless 3:46 (Barnes & Noble) Buy it at: Alpha-music.de, Amazon.de, Amazon.com, BarnesAndNoble.com 2000 The Countdown Singers Instrumental Gold (Album) Track 14: Theme from M*A*S*H (Suicide Is Painless) 3:33 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2000 The Mash (Johnny Mandel) The M*A*S*H March (Single 45rpm) Track 1: Theme from M*A*S*H (Suicide Is Painless) 2:52   1970 Television's Greatest Hits, Vol. 3: 70s & 80s (Sampler) Track 40: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1990 M.A.S.H. (1970 Film) [SOUNDTRACK] (Sampler) Track 1: Theme from M*A*S*H (Suicide Is Painless) 2:52 (Barnes & Noble) Track 10: M*A*S*H (Suicide Is Painless) 2:48 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1995 Cult Files Reopened (Sampler) Disc 2, Track 19: M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1997 Movie Music: The Definitive Performances (Sampler) Disc 2, Track 1: Theme from M*A*S*H (Suicide Is Painless) 2:56 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 Twenty Fifth Anniversary Edition (Sampler) Disc 2, Track 35: Theme from M*A*S*H (Suicide Is Painless) 1:11   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 Real Cinema (Sampler) Disc 2, Track 15: Suicide Is Painless 2:51 Buy it at: Amazon.de, Amazon.com 2001 TV Guide 50 All Time Favourite (Sampler) Track 24: Theme from M*A*S*H (Suicide Is Painless) 0:55 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2002 The Romantic Strings Most Beautiful Melodies of the Century: You Are So Beautiful (Sampler) Track 12: Theme from M*A*S*H (Suicide Is Painless) 2:52 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 Till the End of Time (Sampler) Disc 3, Track 12: Theme from "M*A*S*H" 2:52 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1999 The Ventures TV Themes (LP) Track 7: Suicide Is Painless 3:16   1977 Tele-Ventures: The Ventures Perform the Great TV Themes (Album) Track 17: Theme from M*A*S*H (Suicide Is Painless) 3:16   Buy it at: Amazon.de, Amazon.com 1996 TV Themes/Bobby Vee Meets the Ventures (Album) Track 10: Suicide Is Painless 3:16 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1997 The Ventures Play The Batman Theme/TV Themes (Album) Track 7: Suicide Is Painless 3:16   Buy it at: Amazon.de, Amazon.com 1997 Tony Hatch The Essential Tony Hatch: Grooves Hits and Themes (Album) Disc 3, Track 17: Theme From M*A*S*H 3:09   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2003 Twopointeight TV Sucks (Sampler) Track 12: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 2000 Unknown artists Woodstock Generation (Sampler) Disc 2, Track 11: Suicide Is Painless 2:53   Buy it at: Amazon.de 1994 2004 Classic Instrumentals: Beautiful Arrangements to Capture Every Emotion (Sampler) Track 8: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1995 Television Greatest Hits (Sampler) Track 3: Theme from M*A*S*H (Suicide Is Painless) 3:40   Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 1996 TV Themes America (Sampler) Track 12: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1997 Musiques des Palmes D'or (Sampler) Track 7: Theme from M*A*S*H (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 1997 CBS: The First 50 Years (Sampler) Track 35: Theme from M*A*S*H (Suicide Is Painless) [From M*A*S*H]     Buy it at: Amazon.de, Amazon.com 1998 2002 Most Beautiful Film Themes: 36 Romantic (Sampler) Track 7: M.A.S.H. (Suicide Is Painless)     Buy it at: Amazon.de, Amazon.com 2000 Drew's Famous Sporty at 40: Music for Your Party (Sampler) Track 12: M*a*s*h (Suicide Is Painless) 3:40 (Barnes & Noble) Buy it at: Amazon.de, Amazon.com, BarnesAndNoble.com 2002 The Best of Cult Fiction (Sampler) Disc 2, Track 21: M*A*S*H - Suicide Is Painless (Mash Movie)     Buy it at: Amazon.de, Amazon.com 2004 Golden Sixties! (Sampler) Track 14: MASH (Suicide Is Painless)     ?