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 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 season marked the move of main character Jim Halpert (John Krasinski) from Scranton to Stamford, and also introduced Rashida Jones as Karen Filippelli, and Ed Helms as Andy Bernard—both members of Dunder Mifflin Stamford—as recurring characters.

Returning writers from last season include Daniels, Michael Schur, Gene Stupnitsky, Lee Eisenberg, Jennifer Celotta, Mindy Kaling, Paul Lieberstein, and B. J. Novak.

Joining the writing staff for the third season are Brent Forrester, Justin Spitzer, and Caroline Williams.

Series star Jenna Fischer noted that "It is rare in this business to hear news of a pickup so early", but that NBC was very pleased with how well the show was doing.

While these characters normally have the same attitudes and perceptions as their British counterparts, the roles have been redesigned to better fit the American show.

Despite this, the show's third season was slightly more watched than the previous: it averaged 8.3 million viewers, and scored a 4.1/11 in the Nielsen ratings, meaning that on average 4.1 percent of households 18–49 years old were tuned in at any given moment and 11 percent of all televisions in use at the time were tuned into the program.

Review aggregator website Metacritic gave the third season of the show an 85 out of 100 rating, which translates to the status of "universal acclaim".

[16] Travis Fickett of IGN felt that "In its third season The Office continued to be one of the smartest, funniest and most likable shows on television.

[18] Francis Rizzo III of DVD Talk called the season "an outstanding year for the Scranton crew" and praised the "unbelievably funny 21 episodes in between" the opener and the finale as reasons as to why it was "a great stand-alone season from easily one of the funniest shows on TV.

[25] In the following table, "U.S. viewers (million)" refers to the number of Americans who viewed the episode on the night of broadcast.