The Simpsons season 21

*The Simpsons*
The Simpsons
Season 21
	Digital purchase image featuring Mr. Burns
Showrunner	Al Jean
No. of episodes	23
Release
Original network	Fox
Original release	September 27, 2009 –; May 23, 2010
Season chronology
	← Previous; Season 20 Next →; Season 22
	List of episodes

The twenty-first season of the American animated television series The Simpsons aired on Fox from September 27, 2009, to May 23, 2010. It was the first of two seasons that the show was renewed for by Fox,^[1]^[2]^[3] and also the first season of the show to air entirely in high definition.

With this season, The Simpsons established itself as the longest-running American primetime television series surpassing Gunsmoke.^[4]

The season received mainly positive reviews from critics, with many praising "The Squirt and the Whale", "To Surveil with Love" and "The Bob Next Door". The show moved up 16 positions in the Nielsen ratings from the previous season and received numerous award nominations, winning two — an Emmy Award for Anne Hathaway for her voicing in "Once Upon a Time in Springfield", and an Annie Award for "Treehouse of Horror XX".

^ "Fox announces Fall premiere dates for the 2009-2010 season". June 15, 2009. Archived from the original on July 15, 2009. Retrieved June 15, 2009.
^ ""Best. News. Ever. Fox renews hit animated series "The Simpsons" for two additional". FoxFlash. February 26, 2009. Archived from the original on January 30, 2011. Retrieved February 26, 2009.
^ "Breaking News — Exclusive: FOX Sets 2009-10 Season Finale Dates". The Futon Critic. Retrieved April 10, 2010.
^ Keveney, Bill (September 28, 2008). "'The Simpsons' Hits a Landmark". ABC. Archived from the original on October 2, 2008. Retrieved October 2, 2008.

[Premiere-1] "Fox announces Fall premiere dates for the 2009-2010 season". June 15, 2009. Archived from the original on July 15, 2009. Retrieved June 15, 2009.

[2] ""Best. News. Ever. Fox renews hit animated series "The Simpsons" for two additional". FoxFlash. February 26, 2009. Archived from the original on January 30, 2011. Retrieved February 26, 2009.

[3] "Breaking News — Exclusive: FOX Sets 2009-10 Season Finale Dates". The Futon Critic. Retrieved April 10, 2010.

[4] Keveney, Bill (September 28, 2008). "'The Simpsons' Hits a Landmark". ABC. Archived from the original on October 2, 2008. Retrieved October 2, 2008.

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