The sixth season of the American television comedy The Office premiered in the United States on NBC on September 17, 2009, and concluded on May 20, 2010.

The season stars Steve Carell, Rainn Wilson, John Krasinski, Jenna Fischer, B. J. Novak, and Ed Helms, with supporting performances from Leslie David Baker, Brian Baumgartner, Creed Bratton, Kate Flannery, Mindy Kaling, Ellie Kemper, Angela Kinsey, Paul Lieberstein, Oscar Nunez, Craig Robinson, and Phyllis Smith.

The season was released on DVD and Blu-ray by Universal Studios Home Entertainment in a four-disc box set in the Region 1 area on September 7, 2010.

The show is based upon the British series created by Ricky Gervais and Stephen Merchant, both of whom are executive producers on both the US and UK versions.

Returning writers from the previous season include Mindy Kaling, B. J. Novak, Paul Lieberstein, Lee Eisenberg, Gene Stupnitsky, Brent Forrester, Justin Spitzer, Jennifer Celotta, Aaron Shure, Charlie Grandy, Warren Lieberstein, and Halsted Sullivan.

New writers in the sixth season include Daniel Chun, Jason Kessler (who served as script coordinator) and Jonathan Hughes (who previously wrote several of the Office webisodes).

Cast members B. J. Novak, John Krasinski, Steve Carell, Mindy Kaling and Rainn Wilson all directed episodes as well.

Notable plots that affect the sixth season and beyond include: Many characters portrayed by The Office cast are based on the British version of the show.

The show was nominated for Favorite TV Comedy at the 36th People's Choice Awards, but lost to The Big Bang Theory.