The third season of the American sitcom The Office premiered in the United States on NBC on September 21, 2006, and concluded on May 17, 2007. The season had a total of 25 half-hours of material, divided into 16 half-hour episodes, five 40-minute "super-sized" episodes, and two one-hour episodes. The Office is an American adaptation of the British TV series as a mockumentary portraying the daily lives of office employees in the Scranton, Pennsylvania branch of the fictitious Dunder Mifflin Paper Company. The season stars Steve Carell, Rainn Wilson, John Krasinski, Jenna Fischer, and B. J. Novak, with supporting performances from Melora Hardin, David Denman, Ed Helms, Leslie David Baker, Brian Baumgartner, Kate Flannery, Mindy Kaling, Angela Kinsey, Paul Lieberstein, Oscar Nunez, and Phyllis Smith.

The Office is an American mockumentary sitcom television series based on the 2001–2003 BBC series of the same name created by Ricky Gervais and Stephen Merchant. Adapted for American television by Greg Daniels, a veteran writer for Saturday Night Live, King of the Hill, and The Simpsons, the show depicts the everyday work lives of office employees at the Scranton, Pennsylvania, branch of the fictional Dunder Mifflin Paper Company, and aired on NBC from March 24, 2005, to May 16, 2013, with a total of nine seasons consisting of 201 episodes. The show was co-produced by Daniels' Deedle-Dee Productions and Reveille Productions, in association with Universal Television. The original executive producers were Daniels, Gervais, Merchant, Howard Klein and Ben Silverman, with numerous others being promoted in later seasons.