I have decided to make a list of all films based on comic books, and if I have missed any movies please let me know in the comments section.
Batman
Superman
Superman II
Swamp Thing
Superman III
Supergirl
Superman IV: The Quest for Peace
The Return of Swamp Thing
Batman Warner Bros.
Batman Returns
Batman Forever
Batman & Robin
Steel
Catwoman
Batman Begins
Superman Returns
The Dark Knight
Watchmen
Jonah Hex
Green Lantern
The Road To Perdition
A History of Violence
Constantine
V for Vendetta
Stardust
The Losers
Gen 13
The League of Extraordinary Gentleman
Red
The Spirit
Batman: Mask of the Phantasm
Batman & Mr. Freeze: SubZero
Batman Beyond: Return of the Joker
Batman: Mystery of the Batwoman
The Batman vs. Dracula
Superman: Brainiac Attacks
Teen Titans: Trouble in Tokyo
Superman: Doomsday
Justice League: The New Frontier
Batman: Gotham Knight
Wonder Woman
Tales of the Black Freighter
Green Lantern: First Flight
Superman/Batman: Public Enemies
Justice League: Crisis on Two Earths
Batman: Under the Red Hood
Superman/Batman: Apocalypse
All-Star Superman
Green Lantern: Emerald Knights
Archie: To Riverdale and Back Again
Josie and the Pussycats
Sabrina the Teenage Witch
The Mask
Timecop
Tank Girl
Barb Wire
Mystery Men
Virus
Alien vs. Predator
Hellboy
Sin City
Son of the Mask
300
Aliens vs. Predator: Requiem
Hellboy II: The Golden Army
Baby Huey's Great Easter Adventure
Casper
Casper Meets Wendy
Casper's Scare School
Casper: A Spirited Beginning
Richie Rich
Richie Rich's Christmas Wish
Captain America
Howard the Duck
The Punisher
Captain America
Blade
X-Men
Blade II
Spider-Man
Daredevil
X2
Hulk
The Punisher
Spider-Man 2
Blade: Trinity
Elektra
Man-Thing
Fantastic Four
X-Men: The Last Stand
Ghost Rider
Spider-Man 3
Fantastic Four: Rise of the Silver Surfer
Iron Man
The Incredible Hulk
Punisher: War Zone
X-Men Origins: Wolverine
Iron Man 2
Thor
X-Men: First Class
Captain America: The First Avenger
Kick-Ass
Men in Black
Men in Black II
Ultimate Avengers
Ultimate Avengers 2
The Invincible Iron Man
Doctor Strange: The Sorcerer Supreme
Next Avengers: Heroes of Tomorrow
Hulk Vs
Planet Hulk
Thor: Tales of Asgard
The Smurfs
30 Days of Night
Teenage Mutant Ninja Turtles
Teenage Mutant Ninja Turtles 2: The Secret of The Ooze
Teenage Mutant Ninja Turtles 3
TMNT
The Crow
The Crow: City of Angels
The Crow: Salvation
The Crow: Wicked Player
Dick Tracy
The Rocketeer
The Shadow
Judge Dredd
The Phantom
Spawn
Monkeybone
From Hell
Ghost World
Bulletproof Monk
Art School Confidential
Wanted
Surrogates
Whiteout
Scott Pilgrim VS. The World
Cowboys and Aliens
30 Days of Night: Dark Days
Firebreather
Dylan Dog: Dead of Night
Priest
Tales from the Crypt
Fritz The Cat
The Nine Lifes Of Fritz The Cat
Sheena
Skyline
Red Sonja
BASED ON COMIC STRIPS
Based on The Addams Family:
The Addams Family (1991)
Addams Family Values (1993)
Addams Family Reunion (1998, direct-to-video)
Based on Barney Google and Snuffy Smith:
Private Snuffy Smith (1942)
Hillbilly Blitzkrieg (1942)
Based on Blondie:
Blondie (1938)
Blondie Meets the Boss (1939)
Blondie Takes a Vacation (1939)
Blondie Brings Up Baby (1939)
Blondie on a Budget (1940)
Blondie Has Servant Trouble (1940)
Blondie Plays Cupid (1940)
Blondie Goes Latin (1941)
Blondie in Society (1941)
Blondie Goes to College (1942)
Blondie's Blessed Event (1942)
Blondie for Victory (1942)
It's a Great Life (1943)
Footlight Glamour (1943)
Leave It to Blondie (1945)
Life with Blondie (1945)
Blondie's Lucky Day (1946)
Blondie Knows Best (1946)
Blondie's Big Moment (1947)
Blondie's Holiday (1947)
Blondie in the Dough (1947)
Blondie's Anniversary (1947)
Blondie's Reward (1948)
Blondie's Secret (1948)
Blondie's Big Deal (1949)
Blondie Hits the Jackpot (1949)
Blondie's Hero (1950)
Beware of Blondie (1950)
Based on Brenda Starr:
Brenda Starr (1976, telefilm)
Brenda Starr (1989)
Based on Bringing Up Father:
Bringing Up Father (1928)
Vihtori ja Klaara (1939, Finland)
Bringing Up Father (1946)
Jiggs and Maggie in Society (1948)
Jiggs and Maggie in Court (1948)
Jiggs and Maggie in Jackpot Jitters (1949)
Jiggs and Maggie Out West (1950)
Based on Dennis the Menace:
Dennis the Menace: Dinosaur Hunter (1987, telefilm)
Dennis the Menace (1993)
Dennis the Menace Strikes Again (1998, direct-to-video)
Dennis the Menace: Cruise Control (2002, telefilm)
A Dennis the Menace Christmas (2007, direct-to-video)
Based on Dick Tracy:
Dick Tracy (AKA Dick Tracy, Detective) (1945)
Dick Tracy vs. Cueball (1946)
Dick Tracy's Dilemma (1947)
Dick Tracy Meets Gruesome (1947)
Dick Tracy (1990)
Based on Dondi:
Dondi (1961)
Based on Ella Cinders:
Ella Cinders (1926)
Based on Flash Gordon:
Flash Gordon (1936)
Flash Gordon (1980)
Flash Gordon: The Greatest Adventure of All (1982, telefilm)
Based on Friday Foster:
Friday Foster (1975)
Based on Garfield:
Garfield (2004)
Garfield: A Tail of Two Kitties (2006)
Garfield Gets Real (2007, direct-to-video)
Garfield's Fun Fest (2008, direct-to-video)
Garfield's Pet Force (2009, direct-to-video)
Based on Gasoline Alley:
Gasoline Alley (1951)
Corky of Gasoline Alley (1951)
Based on Harold Teen:
Harold Teen (1928)
Harold Teen (1934)
Based on Heathcliff:
Heathcliff: The Movie (1986)
Based on Jane:
The Adventures of Jane (1949)
Jane and the Lost City (1987)
Based on Joe Palooka:
Palooka (1934)
Joe Palooka, Champ (1946)
Gentleman Joe Palooka (1946)
Joe Palooka in the Knockout (1947)
Joe Palooka in Fighting Mad (1948)
Joe Palooka in Winner Take All (1948)
Joe Palooka in the Big Fight (1949)
Joe Palooka in the Counterpunch (1949)
Joe Palooka Meets Humphrey (1950)
Joe Palooka in Humphrey Takes a Chance (1950)
Joe Palooka in the Squared Circle (1950)
Joe Palooka in Triple Cross (1951)
Based on Jungle Jim:
Jungle Jim (1948)
The Lost Tribe (1949)
Mark of the Gorilla (1950)
Captive Girl (1950)
Jungle Jim in Pygmy Island (1950)
Fury of the Congo (1951)
Jungle Manhunt (1951)
Jungle Jim in the Forbidden Land (1952)
Voodoo Tiger (1952)
Savage Mutiny (1953)
Valley of the Headhunters (1953)
Killer Ape (1953)
Jungle Man-Eaters (1954)
Cannibal Attack (1954)
Jungle Moon Men (1955)
Devil Goddess (1956)
Based on King of the Royal Mounted:
King of the Royal Mounted (1936)
Based on Li'l Abner:
Li'l Abner (1940)
Li'l Abner (1959)
Li'l Abner (1971, telefilm)
Based on Little Annie Rooney:
Little Annie Rooney (1925)
Based on Little Iodine:
Little Iodine (1946), possibly a lost film
Based on Little Nemo:
Little Nemo: Adventures in Slumberland (1989 Japan/1992 United States)
Based on Little Orphan Annie:
Little Orphan Annie (1932)
Little Orphan Annie (1938)
Annie (1982)
Annie: A Royal Adventure! (1995, telefilm)
Annie (1999, telefilm)
Based on Mandrake the Magician:
Mandrake Killing'e karsi (1967, unauthorized Turkish film)
Mandrake (1979, telefilm)
Based on Marmaduke:
Marmaduke (2010)
Based on Modesty Blaise:
Modesty Blaise (1966)
My Name Is Modesty (2003)
Based on The Mostly Unfabulous Social Life of Ethan Green:
The Mostly Unfabulous Social Life of Ethan Green (2005)
Based on Nono-chan:
My Neighbors the Yamadas (1999)
[edit] OBased on Over the Hedge:
Over the Hedge (2006)
Based on Peanuts:
A Boy Named Charlie Brown (1969)
Snoopy, Come Home (1972)
Race For Your Life, Charlie Brown (1977)
Bon Voyage, Charlie Brown (And Don't Come Back!!) (1980)
Based on The Phantom:
The Phantom (1961, telefilm)
The Phantom (1996)
Based on Pogo:
Pogo for President: 'I Go Pogo' (1980)
Based on Popeye:
Popeye (1980)
Popeye's Voyage: The Quest for Pappy (2004, animated)
Based on Prince Valiant:
Prince Valiant (1954)
Prince Valiant (1997)[
Based on Red Ryder:
Tucson Raiders (1944)
Marshal of Reno (1944)
The San Antonio Kid (1944)
Cheyenne Wildcat (1944)
Vigilantes of Dodge City (1944)
Sheriff of Las Vegas (1944)
Great Stagecoach Robbery (1945)
Lone Texas Ranger (1945)
Phantom of The Plains (1945)
Marshal of Laredo (1945)
Colorado Pioneers (1945)
Wagon Wheels Westward (1945)
California Gold Rush (1946)
Sheriff of Redwood Valley (1946)
Sun Valley Cyclone (1946)
Conquest of Cheyenne (1946)
Santa Fe Uprising (1946)
Stagecoach to Denver (1946)
Vigilantes of Boomtown (1947)
Homesteaders of Paradise Valley (1947)
Oregon Trail Scouts (1947)
Rustlers of Devil's Canyon (1947)
Marshal of Cripple Creek (1947)
Ride, Ryder, Ride (1949)
Roll, Thunder, Roll (1949)
The Fighting Redhead (1950)
The Cowboy and the Prizefighter (1950)
Based on Reg'lar Fellers:
Reg'lar Fellers (1941)
Based on Sad Sack:
The Sad Sack (1957)
Based on Skippy:
Skippy (1931)
Based on The Spirit:
The Spirit (1987, telefilm)
The Spirit (2008)[2]
Based on Sweet Gwendoline:
The Perils of Gwendoline in the Land of the Yik-Yak (1984)
Based on Tailspin Tommy:
Mystery Plane (1939)
Sky Patrol (1939)
Danger Flight (1939)
Based on Tamara Drewe:
Tamara Drewe (2010)
Based on Tillie the Toiler:
Tillie the Toiler (1927)
Tillie the Toiler (1941)