1991

All events in 1991.

January

 * 10th: "Bart Gets Hit by a Car" aired for the first time.
 * 24th: "One Fish, Two Fish, Blowfish, Blue Fish" aired for the first time.
 * 31st: "The Way We Was" aired for the first time.

February

 * 7th: "Homer vs. Lisa and the 8th Commandment" aired for the first time.
 * 14th: "Principal Charming" aired for the first time.
 * 17th: Ed Sheeran, singer and guest star, was born.
 * 21st: "Oh Brother, Where Art Thou?" aired for the first time.

March

 * 4th: The Simpsons Arcade Game was released.
 * 7th: "Bart's Dog Gets an "F"" aired for the first time.
 * 15th: "Big Bird's Birthday, or Let Me Eat Cake", Sesame Street special featuring The Simpsons, aired for the first time.
 * 28th: "Old Money" aired for the first time.

April

 * 11th: "Brush with Greatness" aired for the first time.
 * 25th: "Lisa's Substitute" aired for the first time. The Simpsons: Bart vs. the Space Mutants was released.

May

 * 2nd: "The War of the Simpsons" aired for the first time.
 * 9th: "Three Men and a Comic Book" aired for the first time.

July

 * 11th: "Blood Feud" aired for the first time. Season 2 ended.

September

 * 19th: Season 3 started. "Stark Raving Dad" aired for the first time.
 * 26th: "Mr. Lisa Goes to Washington" aired for the first time.

October

 * 3rd: "When Flanders Failed" aired for the first time.
 * 10th: "Bart the Murderer" aired for the first time.
 * 17th: "Homer Defined" aired for the first time.
 * 24th: "Like Father, Like Clown" aired for the first time.
 * 31st: "Treehouse of Horror II" aired for the first time.

November

 * Bart Simpson's Escape from Camp Deadly was released for the.
 * 7th: "Lisa's Pony" aired for the first time.
 * 14th: "Saturdays of Thunder" aired for the first time. Black or White, Michael Jackson music video featuring The Simpsons, aired for the first time.
 * 21st: "Flaming Moe's" aired for the first time.

December

 * 5th: "Burns Verkaufen der Kraftwerk" aired for the first time.
 * 26th: "I Married Marge" aired for the first time.
 * 31st: The Simpsons: Bart vs. the World was released.