H-M
| Title | Director | Cast | Genre | Note |
|---|---|---|---|---|
| The Harrad Experiment | Ted Post | James Whitmore, Tippi Hedren, Don Johnson | Drama | from Robert Rimmer novel |
| Harry in Your Pocket | Bruce Geller | James Coburn, Michael Sarrazin | Drama | United Artists |
| Heavy Traffic | Ralph Bakshi | Joseph Kaufmann, Jamie Farr (voices) | Animated | Adult |
| Hell Up in Harlem | Larry Cohen | Fred Williamson, Julius Harris, Gloria Hendry | Crime drama | American International |
| High Plains Drifter | Clint Eastwood | Clint Eastwood, Geoffrey Lewis, Verna Bloom | Western | Universal |
| Hit! | Sidney J. Furie | Billy Dee Williams, Richard Pryor | Action | |
| The Iceman Cometh | John Frankenheimer | Lee Marvin, Robert Ryan | Drama | from Eugene O'Neill play |
| Idaho Transfer | Peter Fonda | Keith Carradine | Science Fiction | |
| Invasion of the Bee Girls | Denis Sanders | Anitra Ford | Science Fiction | |
| Jesus Christ Superstar | Norman Jewison | Ted Neeley, Carl Anderson | Musical | based on Broadway show |
| Jeremy | Arthur Barron | Robby Benson, Glynnis O'Connor | Romance | |
| Jonathan Livingston Seagull | Hall Bartlett | James Franciscus, Juliet Mills | from Richard Bach novella | |
| Jory | Jorge Fons | Robby Benson | Western | |
| Lady Ice | Tom Gries | Donald Sutherland, Jennifer O'Neill | Crime | |
| The Last American Hero | Lamont Johnson | Jeff Bridges, Valerie Perrine, Ned Beatty | Biopic | story of Junior Johnson |
| The Last Detail | Hal Ashby | Jack Nicholson, Randy Quaid | Comedy, Drama | 3 Oscar nominations |
| The Last of Sheila | Herbert Ross | James Coburn, Raquel Welch, Dyan Cannon, James Mason, Joan Hackett, Richard Benjamin, Ian McShane | Mystery | script by Anthony Perkins and Stephen Sondheim |
| The Laughing Policeman | Stuart Rosenberg | Walter Matthau, Bruce Dern, Louis Gossett, Jr., Joanna Cassidy, Cathy Lee Crosby | Crime drama | based on Swedish novel |
| Little Cigars | Chris Christenberry | Angel Tompkins | Comedy | |
| Lolly-Madonna XXX | Richard C. Sarafian | Rod Steiger, Robert Ryan, Jeff Bridges | Drama | |
| The Long Goodbye | Robert Altman | Elliott Gould, Sterling Hayden, Henry Gibson, Nina van Pallandt, Jim Bouton, Mark Rydell | Mystery | based on Raymond Chandler novel |
| Lost Horizon | Charles Jarrott | Liv Ullmann, Olivia Hussey, Peter Finch, Sally Kellerman, Charles Boyer, Michael York, John Gielgud | Musical, Fantasy | based on novel by James Hilton; remake of 1937 film |
| Love and Pain and the Whole Damn Thing | Alan J. Pakula | Maggie Smith, Timothy Bottoms | Drama | |
| Luther | Guy Green | Stacy Keach, Patrick Magee | Drama, Biography | story of Martin Luther |
| The Mack | Michael Campus | Max Julien, Richard Pryor, Roger E. Mosley | Crime drama | |
| The Mackintosh Man | John Huston | Paul Newman, James Mason | Thriller | based on Desmond Bagley novel |
| Magnum Force | Ted Post | Clint Eastwood, Hal Holbrook, Tim Matheson, David Soul | Crime drama | sequel to Dirty Harry |
| Manson | Laurence Merrick | Vincent Bugliosi | Documentary | story of Charles Manson |
| Mean Streets | Martin Scorsese | Robert De Niro, Harvey Keitel | Drama | 1st Scorsese-De Niro pairing |
| Messiah of Evil aka Dead People | Willard Huyck | Elisha Cook Jr., Anitra Ford | Horror |
Read more about this topic: List Of American Films Of 1973