I need help with the boys so I am sharing.
Dean Stockwell A really good child actor.
The Secret Garden (1949) .... Colin Craven
Down to the Sea in Ships (1949) .... Jed Joy
The Boy with Green Hair (1948) .... Peter Fry
Deep Waters (1948) .... Donny Mitchell
Gentleman's Agreement (1947) .... Tommy Green
Song of the Thin Man (1947) .... Nick Charles Jr.
The Romance of Rosy Ridge (1947) .... Andrew MacBean
The Arnelo Affair (1947) .... Ricky Parkson
A Really Important Person (1947) .... Billy Reilly
The Mighty McGurk (1947) .... Nipper
Home, Sweet Homicide (1946) .... Archie Carstairs
The Green Years (1946) .... Robert Shannon, as a child
Anchors Aweigh (1945) .... Donald Martin - Child runaway
The Valley of Decision (1945) .... Paulie Scott
Macaulay Culkin
Ri¢hie Ri¢h (1994) .... Richie Rich
The Pagemaster (1994) .... Richard Tyler
Getting Even with Dad (1994) .... Timmy Gleason
The Nutcracker (1993) .... The Nutcracker / The Prince / Drosselmeier's Nephew
The Good Son (1993) .... Henry Evans
Home Alone 2: Lost in New York (1992) .... Kevin McCallister
My Girl (1991) .... Thomas J. Sennett
Only the Lonely (1991) .... Billy Muldoon
Home Alone (1990) .... Kevin McCallister
Uncle Buck (1989) .... Miles Russell
See You in the Morning (1989) .... Billy Livingstone
Rocket Gibraltar (1988) .... Cy Blue Black
Elijah Wood
The War (1994) .... Stu Simmons
North (1994) .... North
The Good Son (1993) .... Mark Evans
The Adventures of Huck Finn (1993) .... Huck Finn
Forever Young (1992) .... Nat Cooper
Radio Flyer (1992) .... Mike
The Witness (1992) (TV) .... Little Boy
Paradise (1991) .... Willard Young
Avalon (1990) .... Michael Kaye
Internal Affairs (1990) .... Sean Stretch
Freddie Bartholomew
Listen, Darling (1938) .... Herbert 'Buzz' Mitchell
Lord Jeff (1938) .... Geoffrey Braemer
Kidnapped (1938) .... David Balfour
Captains Courageous (1937) .... Harvey Cheyne
Lloyd's of London (1936) .... Young Jonathan Blake
The Devil Is a Sissy (1936) .... Claude Pierce
Little Lord Fauntleroy (1936) .... Cedric 'Ceddie' Erroll
Professional Soldier (1935) .... King Peter
Anna Karenina (1935) .... Sergei
The Personal History, Adventures, Experience, & Observation of David Copperfield the Younger (1935) .... David Copperfield - the child
Mickey Rooney Oh hell, if you don’t know who he is, you probably should be voting ;)
He made 80+ shorts by the time he was 14. But nothing truly memorable until he was 14+
Jackie Cooper
O'shaughnessy's Boy (1935) .... Joseph 'Stubby' O'Shaughnessy
Dinky (1935) .... Dinky Daniels
Peck's Bad Boy (1934) .... Bill Peck
Treasure Island (1934) .... Jim Hawkins
Lone Cowboy (1933) .... Scooter O'Neal
The Bowery (1933) .... Swipes McGurk
Broadway to Hollywood (1933) .... Ted Hackett Jr., as a child
Divorce in the Family (1932) .... Terry Parker
When a Fellow Needs a Friend (1932) .... Edward Haverford 'Eddie' Randall
Sooky (1931) .... Skippy Skinner
The Champ (1931/I) .... Dink
Jackie Coogan The Top Silent Boy actor.
Buttons (1927) .... Buttons
The Bugle Call (1927) .... Billy Randolph
Johnny Get Your Hair Cut (1927) .... Johnny O'Day
Old Clothes (1925) .... Timothy Kelly
The Rag Man (1925) .... Tim Kelly
Little Robinson Crusoe (1924) .... Mickey Hogan
A Boy of Flanders (1924) .... Nello
Long Live the King (1923) .... Crown Prince Ferdinand William Otto
Circus Days (1923) .... Toby Tyler
Daddy (1923) .... Jackie Savelli/Jackie Holden
Oliver Twist (1922) .... Oliver Twist
Trouble (1922) .... Danny, the Kid
Nice and Friendly (1922) .... Boy
My Boy (1921) .... Jackie Blair
Peck's Bad Boy (1921) .... 'Peck's Bad Boy' (Henry Peck)
The Kid (1921) (as Jack Coogan) .... The Kid
Matthew Garber Only three movie, but three famous Disney movies.
The Gnome-Mobile (1967) .... Rodney
Mary Poppins (1964) .... Michael Banks
The Three Lives of Thomasina (1964) .... Geordie
Rory Culkin
It Runs in the Family (2003) .... Eli Gromberg
Signs (2002) .... Morgan Hess
Igby Goes Down (2002) .... 10-Year-Old Igby
You Can Count on Me (2000) .... Rudy Prescott
Ri¢hie Ri¢h (1994) .... Young Richie
The Good Son (1993) .... Richard in Picture
Brandon De Wilde OK, only one real role but one of the most famous.
Shane (1953) .... Joey Starrett
The Member of the Wedding (1952) .... John Henry
Jonathan Lipnicki
When Zachary Beaver Came to Town (2003) .... Toby Wilson
Stuart Little 2 (2002) .... George Little
Like Mike (2002) .... Murph
The Little Vampire (2000) .... Tony Thompson
Stuart Little (1999) .... George Little
Jerry Maguire (1996) .... Ray Boyd
Fred Savage This kid was great in several good roles.
The Wizard (1989) .... Corey Woods
Little Monsters (1989) .... Brian Stevenson
Vice Versa (1988) .... Charlie Seymour / Marshall Seymour
The Princess Bride (1987) .... The Grandson
Dinosaurs: A Fun Filled Trip Back in Time (1987) .... Philip
The Boy Who Could Fly (1986) .... Louis Michaelson
Seth Green I’ll vote for him for playing Egg alone.
My Stepmother Is an Alien (1988) .... Fred Glass
Can't Buy Me Love (1987) .... Chuckie Miller
Radio Days (1987) .... Joe
Willy/Milly (1986) .... Malcolm
The Hotel New Hampshire (1984) .... 'Egg' Berry
Billions for Boris (1984) .... Benjamin 'Ape-Face' Andrews
Nicholas Hoult Not sure if there was anything else.
About a Boy (2002) .... Marcus
Roddy McDowell His best work was actually as a teen that looked young. Lassie and Flicka in particular.
Confirm or Deny (1941) .... Albert Perkins
How Green Was My Valley (1941) (as Master Roddy McDowall) .... Huw
Man Hunt (1941) .... Vaner
You Will Remember (1941) .... Young Bob Slater
Saloon Bar (1940) .... Boy
Just William (1940) (as Roddy McDowell) .... Ginger
Dead Man's Shoes (1940) .... Boy
Murder Will Out (1940)
Mark Lester
Black Beauty (1971) .... Joe Evans
Melody (1971) .... Daniel
Whoever Slew Auntie Roo? (1971) .... Christopher
The Boy Who Stole the Elephant (1970) (TV) .... Davey
Eyewitness (1970) .... Ziggy
Run Wild, Run Free (1969) .... Philip Ransome
Oliver! (1968) .... Oliver Twist
Our Mother's House (1967) .... Jiminee
Ron Howard
The Courtship of Eddie's Father (1963) (as Ronny Howard) .... Eddie (The movie, not the show)
The Music Man (1962) (as Ronny Howard) .... Winthrop Paroo
Five Minutes to Live (1961) (as Ronnie Howard) .... Bobby
Freddie Highmore:
Charlie and the Chocolate Factory (2005) .... Charlie Bucket
Five Children and It (2004) .... Robert
Finding Neverland (2004) .... Peter Llewelyn Davies
Jack and the Beanstalk: The Real Story (2001) (TV) .... Son at Playground
The Mists of Avalon (2001) (TV) .... Young Arthur
Henry Thomas
Cloak & Dagger (1984) .... Davey Osborne
Misunderstood (1984) .... Andrew
E.T.: The Extra-Terrestrial (1982) .... Elliott
The Steeler and the Pittsburgh Kid (1981) (TV) .... The Kid
Raggedy Man (1981) .... Harry
Lukas Haas
Music Box (1989) .... Mikey Talbot
See You in the Morning (1989) .... Petey Goodwin
The Ryan White Story (1989) (TV) .... Ryan White
The Wizard of Loneliness (1988) .... Wendall
Lady in White (1988) .... Frankie Scarlatti
Solarbabies (1986) .... Daniel
"Amazing Stories" .... Brian Globe (1 episode, 1985) - Ghost Train (1985) TV episode .... Brian Globe
Witness (1985) .... Samuel Lapp