"New Boss" is the twentieth episode of the fifth season of the television series The Office and the 92nd overall episode of the series. It originally aired on NBC in the United States on March 19, 2009. In the episode, Michael Scott is disturbed by the arrival of his new no-nonsense superior Charles Miner, played by The Wire star Idris Elba, making his first of six slated guest appearances with The Office. Meanwhile, Jim struggles to make a good impression on Charles, and Angela and Kelly both develop crushes on their new boss.

The episode was written by Lee Eisenberg and Gene Stupnitsky, and directed by Paul Feig. It received generally positive reviews from television critics, particularly for the twist of Michael's resignation, which multiple reviewers said added a fresh new change to the series. According to Nielsen ratings, "New Boss" was watched by 7.95 million overall viewers in its original airing.

Michael Scott is planning a party to celebrate his fifteenth anniversary at Dunder Mifflin on the same day that new company vice president, Charles Miner, visits Scranton. Charles exhibits a no-nonsense attitude, making Michael insecure about being in charge. Charles establishes a good relationship with the rest of the staff by buying lunch and revealing the truth about their 401(k) plans and the possibility of layoffs, which Michael withheld to avoid worrying anyone. Charles takes up responsibilities that are normally Michael's, causing Michael to wonder whether his position is threatened. Chief Financial Officer David Wallace advises Michael to become better acquainted with Charles, but he is unsuccessful. Michael fails to contact Wallace by phone, with one attempt transferred to Charles. When Charles sees the Party Planning Committee planning Michael's party, he dissolves the committee, saying it is irresponsible to spend company resources on recreation while employees are being laid off. Frustrated with being undermined, Michael drives to New York to talk to Wallace.

Jim Halpert wears a tuxedo in response to a memo written by Dwight Schrute about "professionalism in the workplace". This leads to an awkward encounter with Charles as Jim explains the tuxedo is a prank. Jim is further scrutinized by Charles when he notices Jim's idea of a "two-way petting zoo" for Michael's party. Jim tries elevating his standing with Charles by discussing his position as Assistant Regional Manager, but when Charles presses him about the position, Jim confesses Michael made it up to appease Dwight. When Charles leaves, Jim says goodbye, with no response. Jim halfheartedly jokes that his career could be over.

Angela Martin and Kelly Kapoor develop crushes on Charles, but their flirtations make him uncomfortable. At the end of the day Kelly puts on more makeup to tempt Charles into asking her out, but he has left. Kelly runs out to the parking lot, finding Angela holding Charles's scarf and chases her. Angela says that Charles deserves better than Kelly.

In New York, Michael tracks down Wallace, who has seemingly been avoiding him. Michael complains about being forced to drive to New York to talk to him, and that he deserves more respect after fifteen years at Dunder Mifflin. David agrees to fund and attend an anniversary party for him. Dissatisfied that David is missing the bigger point, Michael responds by announcing his resignation.

I am much more courageous in real life with the parts I want to play. They don't often come my way. The Office is comedy. No one in a month of Sundays would invite me do comedy. So I love the fact that someone is out there looking and understanding that there might be more in this nutshell.

"New Boss" was written by Lee Eisenberg and Gene Stupnitsky and directed by Paul Feig. Executive story editor Charlie Grandy conceived the idea of Michael leaving Dunder Mifflin. "New Boss" was the first of six episodes Idris Elba was set to guest star in as Charles, Michael's new Dunder Mifflin superior. It was his first role in a comedy and his first television appearance since leaving his regular role on HBO's The Wire, where he played the character Stringer Bell. Elba, a fan of The Office, said, "The creators of the show called me, said they wanted to put me in as this new character, that I’d be perfect for it, and I was honored, so I said yeah. [...] I’m still playing the straight guy, but he’s kind of got a bit of a quirk to him." The writing staff for The Office were fans of The Wire, and had referred to the show in previous episodes. Of the six episodes Elba appeared in, he said "New Boss" was the only one he watched immediately after they aired because, "I'm hypercritical about my work, so I try not to torture myself." Elba is the second actor from The Wire to appear on The Office, after actress Amy Ryan, who played Michael's love interest Holly Flax. Paul Lieberstein, the Office producer who also plays Toby, said Elba's work on The Wire made him "a really interesting and great foil for Michael". John Krasinski said Elba was initially an intimidating presence on the set, due to the ruthless character he plays on The Wire. However, Krasinski said Elba proved to be "incredibly nice and incredibly funny".