1940s

The 1940s is the decade William Hanna and Joseph Barbera first collaborated on an animated project, but before they founded Hanna-Barbera.

All of their work was directing the Tom and Jerry theatrical shorts done at MGM Cartoons. This list also includes the Droopy theatrical shorts also done at MGM Cartoons, which Hanna and Barbera would be attached to as producers in the 1950s.

1940

 * Tom and Jerry
 * Puss Gets the Boot - February 10

1941

 * The Alley Cat - July 5
 * Tom and Jerry
 * The Midnight Snack - July 19
 * The Night Before Christmas - December 6

1942

 * Tom and Jerry
 * Fraidy Cat - January 16
 * Dog Trouble - April 18
 * Puss n' Toots - May 30
 * The Bowling Alley-Cat - July 18
 * Fine Feathered Friend - October 10

1943

 * Tom and Jerry
 * Sufferin' Cats! - January 16
 * Droopy
 * Dumb-Hounded - March 20 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * The Lonesome Mouse - May 22
 * The Yankee Doodle Mouse - June 26
 * Baby Puss - December 25

1944

 * Tom and Jerry
 * The Zoot Cat - February 28
 * The Million Dollar Cat - May 6
 * The Bodyguard - July 22
 * Puttin' on the Dog - October 28
 * Mouse Trouble - November 23

1945

 * Droopy
 * The Shooting of Dan McGoo - March 3 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * The Mouse Comes to Dinner - May 5
 * Mouse in Manhattan - July 7
 * Tee for Two - July 21
 * Flirty Birdy - September 22
 * Droopy
 * Wild and Woolfy - November 3 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * Quiet Please! - December 22

1946

 * Tom and Jerry
 * Springtime for Thomas - March 30
 * The Milky Waif - May 18
 * Trap Happy - June 29
 * Droopy
 * Northwest Hounded Police - August 3 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * Solid Serenade - August 31

1947

 * Tom and Jerry
 * Cat Fishin' - February 22
 * Part Time Pal - March 15
 * The Cat Concerto - April 26
 * Dr. Jekyll and Mr. Mouse - June 14
 * Salt Water Tabby - July 12
 * A Mouse in the House - August 30
 * The Invisible Mouse - September 27

1948

 * Tom and Jerry
 * Kitty Foiled - June 1
 * The Truce Hurts - July 17
 * Old Rockin' Chair Tom - September 18
 * Professor Tom - October 30
 * Mouse Cleaning - December 11

1949

 * Tom and Jerry
 * Polka-Dot Puss - February 26
 * Droopy
 * Señor Droopy - April 9 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * The Little Orphan - April 30
 * Hatch Up Your Troubles - May 14
 * Heavenly Puss - July 9
 * Droopy
 * Wags to Riches - August 13
 * Tom and Jerry
 * The Cat and the Mermouse - September 3
 * Love That Pup - October 1
 * Jerry's Diary - October 22
 * Droopy
 * Out-Foxed - November 5 (involves neither Hanna or Barbara)
 * Tom and Jerry
 * Tennis Chumps - December 10