| Notice to Quit (2024) |
| Before I Go (2021) Jasper |
| Robert Klein Still Can't Stop His Leg (2016) |
| Sharknado 3: Oh Hell No! (2015) Mayor of New York |
| Sharknado 2: The Second One (2014) Mayor |
| Putzel (2012) Narrator (voice) |
| Another Dirty Movie (2012) CEO |
| Demoted (2011) Bob Farrell |
| Dirty Movie (2011) The CEO |
| Robert Klein: Unfair & Unbalanced (2010) Robert Klein |
| The Back-Up Plan (2010) Dr. Scott Harris |
| Pocket Full of Soul: The Harmonica Documentary (2009) Self |
| Definitely, Maybe (2008) Robert Klein |
| Monty Python Conquers America (2008) Self |
| Jerry Seinfeld: The Comedian Award (2007) Self |
| Reign Over Me (2007) Jonathan Timpleman |
| Ira & Abby (2006) Seymour Black |
| The Best of The Tony Awards: The Plays (2006) Mervyn Kant (segment "The Sisters Rosensweig") |
| Robert Klein: The Amorous Busboy of Decatur Avenue (2005) Self |
| How to Lose a Guy in 10 Days (2003) Phillip Warren |
| Two Weeks Notice (2002) Larry Kelson |
| People I Know (2002) Dr. Sandy Napier |
| The Safety of Objects (2002) Howard Gold |
| Comedian (2002) Self |
| I'm with Lucy (2002) Dr. Mort Zalkind |
| Piñero (2001) Doctor |
| Robert Klein: Child in His 50s (2000) Himself |
| Labor Pains (2000) David Raymond |
| From Where I Sit (2000) Lenny |
| Funny Is Money (1999) Self |
| Goosed (1999) Mel |
| Yesterday's Tomorrows (1999) Self |
| The Contract (1999) Jackson |
| Suits (1999) Tom Cranston |
| Next Stop Wonderland (1998) Arty Lesser |
| Jerry Seinfeld: I'm Telling You for the Last Time (1998) Self |
| Monty Python: Live at Aspen (1998) Host |
| Primary Colors (1998) Norman Asher |
| One Fine Day (1996) Dr. Martin |
| Robert Klein: It All Started Here (1995) Himself |
| Clarissa (1995) Hugh Hamilton |
| Jeffrey (1995) Skip Winkley |
| Mixed Nuts (1994) Mr. Lobel |
| Radioland Murders (1994) Father Writer |
| Laurel and Hardy: A Tribute to the Boys (1992) Self |
| Mike Mulligan and His Steam Shovel (1990) Narrator (voice) |
| Night of 100 Stars III (1990) Self |
| Comic Relief '90 (1990) Self |
| Tales from the Darkside: The Movie (1990) Wyatt (segment ‘Lover’s Vow’) |
| Dangerous Curves (1988) Bam Bam |
| An All-Star Toast to the Improv (1988) Self |
| Robert Klein on Broadway (1986) Himself |
| The Best of John Belushi (1985) Various Characters |
| This Wife for Hire (1985) Alan Harper |
| Night of 100 Stars II (1985) Self |
| Poison Ivy (1985) 'Big Irv' Klopper |
| Summer Switch (1984) Bill Andrews |
| Robert Klein: Child of the 50's, Man of the 80's (1984) Himself |
| Pajama Tops (1983) Lenny Jolie-Jolie |
| Your Place... or Mine? (1983) Nick |
| The Last Unicorn (1982) The Butterfly (voice) |
| On Location: Robert Klein at Yale (1982) Himself |
| Night of 100 Stars (1982) Self |
| The Marx Brothers in a Nutshell (1982) Self |
| Nobody's Perfekt (1981) Walter |
| All Commercials... A Steve Martin Special (1980) Self |
| Echoes of the Sixties: A Musical Trip (1979) Self |
| The Bell Jar (1979) Lenny |
| Hooper (1978) Robert Deal |
| Dick Clark's Good Old Days (1977) |
| Robert Klein Revisited (1977) Himself |
| Le Gang (1977) |
| An Evening with Robert Klein (1975) Himself |
| Le Gitan (1975) |
| Rivals (1972) Peter |
| The Pursuit of Happiness (1971) Melvin Lasher |
| The Owl and the Pussycat (1970) Barney |
| The Landlord (1970) Peter |
| They're Playing Our Song Vernon Gersch |