1993

All events that happened in 1993.

January

 * 14th: "Marge vs. the Monorail" aired for the first time.
 * 21st: "Selma's Choice" aired for the first time.

February

 * 4th: "Brother from the Same Planet" aired for the first time.
 * 11th: "I Love Lisa" aired for the first time.
 * 18th "Duffless" aired for the first time.

March

 * 11th: "Last Exit to Springfield" aired for the first time.

April

 * 1st: "So It's Come to This: A Simpsons Clip Show" aired for the first time.
 * 15th: "The Front" aired for the first time.
 * 29th: "Whacking Day" aired for the first time.

May

 * 6th: "Marge in Chains" aired for the first time.
 * 13th: "Krusty Gets Kancelled" aired for the first time. Season 4 ended.

June

 * 5th: Michael P. Schoenbrun, executive in charge of Gracie Films, died.

July

 * 21st: Robert Glass, a sound re-recording mixer, died.

September

 * 30th: Season 5 started. "Homer's Barbershop Quartet" aired for the first time.

October

 * 7th: "Cape Feare" aired for the first time.
 * 14th: "Homer Goes to College" aired for the first time.
 * 21st: "Rosebud" aired for the first time.
 * 28th: "Treehouse of Horror IV" aired for the first time.

November

 * was released in the US.
 * 4th: "Marge on the Lam" aired for the first time.
 * 11th: "Bart's Inner Child" aired for the first time.
 * 18th: "Boy-Scoutz 'n the Hood" aired for the first time.

December

 * 9th: "The Last Temptation of Homer" aired for the first time.
 * 16th: "$pringfield (Or, How I Learned to Stop Worrying and Love Legalized Gambling)" aired for the first time.