The Simpsons’ twenty-third season began airing on Fox on September 25, 2011 and ended on May 20, 2012. The show’s 500th episode, “At Long Last Leave”, aired on February 19, 2012.
23 - 1The Falcon and the D'Ohman Sep. 25, 2011
23 - 2Bart Stops to Smell the Roosevelts Oct. 02, 2011
23 - 3Treehouse of Horror XXII Oct. 30, 2011
23 - 4Replaceable You Nov. 06, 2011
23 - 5The Food Wife Nov. 13, 2011
23 - 6The Book Job Nov. 20, 2011
23 - 7The Man in the Blue Flannel Pants Nov. 27, 2011
23 - 8The Ten-Per-Cent Solution Dec. 04, 2011
23 - 9Holidays of Future Passed Dec. 11, 2011
23 - 10Politically Inept, with Homer Simpson Jan. 08, 2012
23 - 11The D'oh-cial Network Jan. 15, 2012
23 - 12Moe Goes from Rags to Riches Jan. 29, 2012
23 - 13The Daughter Also Rises Feb. 12, 2012
23 - 14At Long Last Leave Feb. 19, 2012
23 - 15Exit Through the Kwik-E-Mart Mar. 04, 2012
23 - 16How I Wet Your Mother Mar. 11, 2012
23 - 17Them, Robot Mar. 18, 2012
23 - 18Beware My Cheating Bart Apr. 15, 2012
23 - 19A Totally Fun Thing That Bart Will Never Do Again Apr. 29, 2012
23 - 20The Spy Who Learned Me May. 06, 2012
23 - 21Ned 'n' Edna's Blend May. 13, 2012
23 - 22Lisa Goes Gaga May. 20, 2012