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- Joan Hackett ("A Piano in the House")
- Kevin Hagen ("Elegy" and "You Drive")
- Ron Hagerthy ("Dead Man's Shoes")
- Kenneth Haigh ("The Last Flight")
- Robert Haines ("The Silence") (uncredited)
- Barnaby Hale ("He's Alive")
- Bernie Hamilton ("Shadow Play")
- Joe Hamilton ("Mirror Image")
- Kim Hamilton ("The Big Tall Wish")
- Murray Hamilton ("One for the Angels")
- Reid Hammond ("Long Distance Call")
- Jan Handzlik ("The Monsters Are Due on Maple Street")
- John Hanek ("You Drive")
- Cedric Hardwicke ("Uncle Simon")
- Betty Harford ("Person or Persons Unknown")
- John Harmon (actor) ("The Dummy" and "Of Late I Think of Cliffordville")
- Jonathan Harris ("Twenty Two" and "The Silence")
- Sam Harris ("Passage on the Lady Anne") (uncredited)
- Susan Harrison ("Five Characters in Search of an Exit")
- Elizabeth Harrower (actress) ("I Am the Night—Color Me Black") (uncredited)
- Buddy Hart ("The Changing of the Guard")
- Dee Hartford ("The Bewitchin' Pool")
- Mariette Hartley ("The Long Morrow")
- Paul Hartman ("Back There")
- Bob Hastings ("I Dream of Genie")
- Ed Haskett ("The Silence") (uncredited)
- Tom Hatcher ("It's a Good Life")
- Joe Haworth ("Execution)
- Richard Haydn ("A Thing About Machines")
- Ryan Hayes ("A Stop at Willoughby") (uncredited) and "Printer's Devil" (uncredited))
- Brooke Hayward ("The Masks")
- Dodie Heath ("Long Live Walter Jameson") (credited as Dody Heath)
- Jay Hector ("Mr. Dingle, the Strong")
- Kim Hector ("The Bewitchin' Pool")
- Patrick Hector ("The Last Rites of Jeff Myrtlebank")
- Wayne Heffley ("The Odyssey of Flight 33" and "Black Leather Jackets" (uncredited))
- Jo Helton ("On Thursday We Leave for Home" and "The Shelter")
- Percy Helton ("Mute" and "Mr. Garrity and the Graves")
- Butch Hengen ("A Stop at Willoughby") (uncredited)
- Charles Herbert ("I Sing the Body Electric")
- Pitt Herbert ("Cavender Is Coming") (uncredited)
- Jean Heremans ("The Silence") (uncredited)
- Irene Hervey ("Black Leather Jackets")
- Douglas Heyes ("The Invaders") (voice only) (uncredited)
- Douglas Heyes, Jr. ("Dust")
- Joanna Heyes ("The Eye of the Beholder")
- Barton Heyman ("Probe 7, Over and Out")
- Bill Hickman ("Ring-a-Ding Girl") (uncredited)
- Chuck Hicks ("Steel" and "Ninety Years Without Slumbering" (uncredited))
- Joe Higgins ("Person or Persons Unknown")
- Carol Hill ("Five Characters in Search of an Exit")
- Marcel Hillaire ("A Most Unusual Camera" and "The New Exhibit")
- Pat Hingle ("The Incredible World of Horace Ford")
- Earle Hodgins ("Kick the Can")
- Robert J. Hogan ("Spur of the Moment")
- Jonathan Hole ("The Mighty Casey")
- Earl Holliman ("Where Is Everybody?")
- John Holland ("The Silence")
- Sterling Holloway ("What's in the Box")
- Rex Holman ("The Passersby")
- Wendell Holmes ("Escape Clause")
- Bob Hopkins ("The Four of Us Are Dying") (uncredited)
- Dennis Hopper ("He's Alive")
- Geoffrey Horne ("The Gift")
- Peter Hornsby ("A Nice Place to Visit") (uncredited)
- Russell Horton ("The Changing of the Guard" and In Praise of Pip" (uncredited))
- Charles Horvath ("The Big Tall Wish") (uncredited)
- James Houghton ("The Last Rites of Jeff Myrtlebank")
- Mona Houghton ("Five Characters in Search of an Exit")
- Jennifer Howard ("The Eye of the Beholder")
- Ron Howard ("Walking Distance")
- Rodolfo Hoyos, Jr. ("The Mirror")
- Clegg Hoyt ("Static" and "The Bard")
- John Hoyt ("The Lateness of the Hour" and "Will the Real Martian Please Stand Up?")
- Billy E. Hughes ("The Incredible World of Horace Ford")
- Robin Hughes ("The Howling Man")
- Arthur Hunnicut ("The Hunt")
- Marsha Hunt ("Spur of the Moment")
- Henry Hunter ("Long Distance Call")
- Josephine Hutchinson ("I Sing the Body Electric")
- Kendrick Huxam ("Judgment Night")
- Jim Hutton ("And When the Sky Was Opened")
- Jack Hyde ("Shadow Play")
- Wilfrid Hyde-White ("Passage on the Lady Anne")
- Diana Hyland ("Spur of the Moment")
Read more about this topic: List Of The Twilight Zone (1959 TV Series) Guest Stars