2009

All events that happened in 2009.

January

 * 13th: Patrick McGoohan, actor and guest star, died.
 * 25th: "Lisa the Drama Queen" aired for the first time.
 * 27th: John Updike, writer and guest star, died.

February

 * 15th: "Take My Life, Please" aired for the first time. This was the first time an episode was broadcasted in HD. The new opening sequence started.

March

 * 1st: "How the Test Was Won" aired for the first time.
 * 8th: "No Loan Again, Naturally" aired for the first time.
 * 15th: "Gone Maggie Gone" aired for the first time.
 * 17th: "In the Name of the Grandfather" aired for the first time in the UK, before any other country.
 * 29th: "Wedding for Disaster" aired for the first time.

April

 * 5th: "Eeny Teeny Maya, Moe" aired for the first time.
 * 9th: The Simpsons Stamps were released.
 * 19th: "The Good, the Sad, and the Drugly" aired for the first time.
 * 26th: "Father Knows Worst" aired for the first time.

May

 * 2nd: Bongo Comics Free-For-All 2009 is released on Free Comic Book Day.
 * 3rd: "Waverly Hills 9-0-2-1-D'oh" aired for the first time.
 * 10th: "Four Great Women and a Manicure" aired for the first time.
 * 17th: "Coming to Homerica" aired for the first time. Season 20 finished.

June

 * 23rd: Ed McMahon, TV host and guest star, died.
 * 25th: Michael Jackson, singer and guest star, died.

August

 * 18th: The Complete Twelfth Season is released on DVD for North America.

September

 * 2nd: The Complete Twelfth Season is released on DVD for Australia.
 * 27th: Season 21 started. "Homer the Whopper" aired for the first time.
 * 28th: The Complete Twelfth Season is released on DVD for the United Kingdom.

October

 * 4th: "Bart Gets a "Z"" aired for the first time.
 * 11th: "The Great Wife Hope" aired for the first time.
 * 18th: "Treehouse of Horror XX" aired for the first time.

November

 * 15th: "The Devil Wears Nada" aired for the first time.
 * 22nd: "Pranks and Greens" aired for the first time.
 * 29th: "Rednecks and Broomsticks" aired for the first time.

December

 * 13th: "Oh Brother, Where Bart Thou?" aired for the first time.