M
- Tina Majorino (born 1985)
- Camp Wilder (1992)
- Andre (1994)
- When a Man Loves a Woman (1994)
- Corrina, Corrina (1994)
- Waterworld (1995)
- New York Crossing (1996)
- Santa Fe (1997)
- True Women (1997)
- Before Women Had Wings (1997)
- Merry Christmas George Bailey (1997)
- Alice in Wonderland (1999)
- Jena Malone (born 1984)
- Bastard Out of Carolina (1996)
- Hidden in America (1996)
- Ellen Foster (1997)
- Contact (1997)
- Hope (1997)
- Stepmom (1998)
- For Love of the Game (1999)
- Cheaters (2000)
- Donnie Darko (2001)
- Life as a House (2001)
- Kipp Marcus (1970)
- The New Leave It to Beaver (1984–1989)
- Sparky Marcus (born 1967)
- Sigmund and the Sea Monsters (1973–1975)
- The Nancy Walker Show (1976)
- Mary Hartman, Mary Hartman (1976–1977)
- Freaky Friday (1976)
- The Pinballs (1977)
- The Bad News Bears (1979–1980)
- Richie Rich (1980–1984) (voice)
- Challenge of the GoBots (1984–1985) (voice)
- Sean Marshall (born 1965)
- The Deadly Trackers (1973)
- Pete's Dragon (1977)
- Stickin' Together (1978)
- The Small One (1978) (voice)
- Desperate Remedies (1993)
- Vincent Martella (born 1992)
- Everybody Hates Chris (2005–2009)
- Deuce Bigalow: European Gigolo (2005)
- Phineas and Ferb (2007–present)
- Bait Shop (2008)
- Role Models (2008)
- Batman: Under the Red Hood (2010)
- Ultimate Spider-Man (2010)
- Ned's Declassified School Survival Guide
- Graham Patrick Martin (born 1991)
- The Girl Next Door (2007)
- The Bill Engvall Show (2007–present)
- Meaghan Jette Martin (born 1992)
- The Suite Life of Zack & Cody (2007)
- Camp Rock (2008)
- 10 Things I Hate About You (2009–2010)
- Christopher Massey (born 1990)
- Zoey 101 (2005–2008)
- Kyle Massey (born 1991)
- That's So Raven (2003–2007)
- Life Is Ruff (2005)
- Cory in the House (2007–2009)
- Christopher Kennedy Masterson (born 1980)
- Singles (1992)
- Cutthroat Island (1995)
- The Sunchaser (1996)
- Danny Masterson (born 1976)
- Beethoven's 2nd (1993)
- Pat Mastroianni (1971)
- Degrassi Junior High (1987–1989)
- Heather Matarazzo (born 1982)
- Welcome to the Dollhouse (1995)
- The Devil's Advocate (1997)
- 54 (1998)
- Jerry Mathers (born 1948)
- The Trouble With Harry (1955)
- Leave it to Beaver (1957–1963)
- Tim Matheson (born 1947)
- Jonny Quest (1964)
- Larry Mathews (born 1955)
- The Dick Van Dyke Show (1961–1966)
- Julianna Rose Mauriello (born 1991)
- Oklahoma! The Musical (2002–2003)
- Gypsy: A Musical Fable
- Hip Hop Kids: Hip Hop Homeroom Math (2006)
- Lazytown (2004–2006)
- MacKenzie Mauzy (born 1988)
- Guiding Light (2000–2002)
- Abigail Mavity (born 1993)
- The Fighting Fitzgeralds (2001)
- The Jennie Project (2001)
- When Billie Beat Bobby (2001)
- Coastlines (2002)
- 100 Mile Rule (2002)
- Joseph Mazzello (born 1983)
- Jurassic Park (1993) - as Tim
- The River Wild (1994)
- Simon Birch (1998)
- Jesse McCartney (born 1987)
- All My Children (1998–2001)
- The Pirates of Central Park (2001)
- The Strange Legacy of Cameron Cruz (2002)
- Summerland (2004–2005)
- Marley S. McClean (born 1987)
- Star Trek: Voyager (1999–2001)
- Patty McCormack (born 1945)
- Two Gals and a Guy (1951)
- Here Comes the Groom (1951)
- The Bad Seed (1956)
- Maureen McCormick (born 1956)
- The Brady Bunch (1969–1974)
- The Brady Kids (1972–1974) (voice)
- Darius McCrary (born 1976)
- Mississippi Burning (1988)
- Family Matters (1989–1998)
- Kimberly McCullough (born 1978)
- General Hospital (1985–1997, 1997–1999, 2005–present)
- Jennette McCurdy (born in 1992)
- Zoey 101 (2005)
- iCarly (2007–present)
- Mary Elizabeth McDonough (born 1961)
- The Waltons (1972–1981)
- George McFarland (1928–1993)
- Our Gang (1932–1942)
- Danica McKellar (born 1975)
- The Wonder Years (1988–1993)
- Nancy McKeon (born 1966)
- The Facts of Life (1980–1988)
- Philip McKeon (born 1964)
- Alice (1976–1985)
- James Vincent McNichol (* aka Jimmy McNichol) (born 1961)
- General Hospital (1963)
- Little House on the Prairie (1974)
- Shazam (1975)
- Kristy McNichol (born 1962)
- Family (1976–1980)
- The End (1978)
- Little Darlings (1980)
- David Mendenhall (born 1971)
- General Hospital (1980–1986)
- Space Raiders (1983)
- The Transformers (1986) (voice)
- Over the Top (1987)
- Ryan Merriman (born 1983)
- The Mommies (1993–1995)
- The Pretender (1996–2000)
- What's Right with America (1997)
- Everything That Rises (1998)
- Night Ride Home (1999)
- Lansky (1999)
- The Deep End of the Ocean (1999) - as Ben
- Smart House (1999)
- Just Looking (1999)
- Rocket's Red Glare (2000)
- The Luck of the Irish (2001)
- Ari Meyers (born 1969)
- Author! Author! (1982)
- Kate & Allie (1984–1989)
- Melissa Michaelsen (born 1968)
- Me and Maxx (1980)
- Amanda Michalka (born 1991)
- Passions (2002)
- Birds of Prey (2002–2003)
- The Guardian (2002–2004)
- Oliver Beene (2003–2004)
- General Hospital (2004)
- Six Feet Under (2004)
- Kitty's Dish (2005)
- Drew Mikuska (born 1994)
- Scary Movie 3 (2003)
- Scary Movie 4 (2006)
- Alyssa Milano (born 1972)
- Who's the Boss? (1984–1992)
- Old Enough (1984)
- Commando (1985)
- The Canterville Ghost (1986)
- Crash Course (1988)
- Dance 'Til Dawn (1988)
- Speed Zone! (1989)
- Jeremy Miller (born 1976)
- Growing Pains (1985–1992)
- The Willies (1990)
- Shirley Mills (1926-2010)
- Child Bride (1935)
- The Grapes of Wrath (1940)
- Sal Mineo (1939–1976)
- Rebel Without a Cause (1955)
- Giant (1956)
- Somebody Up There Likes Me (1956)
- Beverley Mitchell (born 1981)
- Children of the Bride (1990)
- Sinatra (1992)
- 7th Heaven (1996–2007)
- The Crow: City of Angels (1996)
- Ilan Mitchell-Smith (born 1969)
- The Wild Life (1984)
- Weird Science (1985)
- Kel Mitchell (born 1978)
- All That (1994–1999)
- Kenan & Kel (1996–2000) - as Kel
- Good Burger (1997)
- Nomi Mitty (born 1939)
- A Tree Grows in Brooklyn (1951) Broadway musical
- Taylor Momsen (born 1993)
- How the Grinch Stole Christmas (2000)
- We Were Soldiers (2002)
- Spy Kids 2: Island of Lost Dreams (2002)
- Hansel & Gretel (2002)
- Saving Shiloh (2005)
- Gossip Girl (2007–2011)
- Erin Moran (born 1960)
- How Sweet It Is! (1968)
- Daktari (1968–69)
- Death Valley Days (1969)
- 80 Steps to Jonah (1969)
- Watermelon Man (1970)
- Family Affair (1970–71)
- O'Hara, U.S. Treasury (1971)
- Bearcats! (1971)
- Lisa, Bright and Dark (1973)
- Happy Days (1974–1984)
- Trevor Morgan (born 1986)
- Barney's Great Adventure (1998)
- I'll Remember April (1999)
- The Sixth Sense (1999)
- The Patriot (2000)
- Jurassic Park III (2001)
- Uncle Nino (2003)
- Ernie Morrison (1912–1989)
- Haunted Spooks (1920)
- Our Gang (1922–1924)
- Elisabeth Moss (born 1982)
- Once Upon a Forest (1993) (voice)
- Escape to Witch Mountain (1995)
- Taj Mowry (born 1986)
- Smart Guy (1997–1999)
- Tamera Mowry (born 1978)
- Full House (1992)
- Sister, Sister (1994–1999)
- The Adventures of Hyperman (1995)
- Tia Mowry (born 1978)
- Full House (1992)
- Sister, Sister (1994–1999)
- The Adventures of Hyperman (1995)
- Bill Mumy (born 1954)
- The Twilight Zone (1961–1963)
- Sammy the Way-Out Seal (1962)
- Lost in Space (1965–1968) - as Will Robinson
- Rascal (1969)
- Liliana Mumy (born 1994)
- My Neighbors the Yamadas (1999)
- The Santa Clause 2 (2002)
- Stitch! The Movie (2003)
- Cheaper by the Dozen (2003)
- Hauru no ugoku shiro (2004)
- Mulan II (2004)
- Lilo & Stitch 2: Stitch Has a Glitch (2005)
- Cheaper by the Dozen 2 (2005)
- Frankie Muniz (born 1985)
- What the Deaf Man Heard (1997)
- Lost & Found (1999)
- Malcolm in the Middle (2000–2006) - as Malcolm
- My Dog Skip (2000) - as Willie
- Big Fat Liar (2002)
- Agent Cody Banks (2003) - as Cody Banks
- Erin Murphy (born 1964)
- Bewitched (1966–1972) - as Tabitha Stephens
- Mitchel Musso (born 1991)
- Secondhand Lions (2003)
- Life Is Ruff (2005)
- Hannah Montana (2005–present) - as Oliver
- Monster House (2006)
- Helen Myres (aka Baby Marie) (1911–2010)
- Kidnapped In New York (1914)
- Little Mary Sunshine (1916)
- Sunshine and Gold (1917)
- Daddy's Girl (1918)
- The Locked Heart (1918)
- Winning Grandma (1918)
- The Sawdust Doll (1919)
- Daddy Number Two (1919)
- Miss Gingersnap (1919)
Read more about this topic: List Of Former Child Actors From The United States