Season 4, Episode 1: Fun Run
　　Original Air Date—27 September 2007
　　Michael accidentally runs over Meridith in the parking lot, and his guilt causes him to organize a 5-K run for her. Dwight and Angela have a falling-out after he kills her cat, and the Jim and Pam's relationship is discovered.
　　Season 4, Episode 2: Dunder Mifflin Infinity
　　Original Air Date—4 October 2007
　　Michael feels threatened when Ryan returns to the Scranton office to share his ideas about the future of Dunder Mifflin. Jim and Pam's relationship is shared with the entire office, while Angela and Dwight's relationship is on the rocks.
　　Season 4, Episode 3: Launch Party
　　Original Air Date—11 October 2007
　　The Dunder Mifflin Infinity website is launching and Michael is excited about going to the big launch party in New York while Angela plans a satellite party for the Scranton branch. Meanwhile, Dwight competes against the website to see who can sell the most paper in one day.
　　Season 4, Episode 4: Money
　　Original Air Date—18 October 2007
　　As Jan renovates the condo, Michael confronts his growing debt every way he can, which includes pressuring his employees for a loan. Pam and Jim spend a night out on Dwight's family farm, now a bed and breakfast.
　　Season 4, Episode 5: Local Ad
　　Original Air Date—25 October 2007
　　Michael tries to make a local Dunder Mifflin commercial that is better than the one the professional ad agency made for them. Meanwhile, Andy tries to confide in Dwight about his new relationship with Angela.
　　Season 4, Episode 6: Branch Wars
　　Original Air Date—1 November 2007
　　Michael and Dwight try to play a prank on Karen, who is now manager of the Utica branch, after she tries to steal Stanley from the Scranton office. Meanwhile, Pam, Toby, and Oscar start their own exclusive office book club.
　　Season 4, Episode 7: Survivor Man
　　Original Air Date—8 November 2007
　　After Michael isn't invited to a camping trip with Ryan, he sets out to prove that he can brave it out in the wilderness by himself. Jim, who is in charge of the office while Michael is gone, tries to change the birthday party policy.
　　Season 4, Episode 8: The Deposition
　　Original Air Date—15 November 2007
　　Michael is put in an awkward position when Jan sues Dunder-Mifflin for wrongful termination and he is deposed as a witness. Meanwhile, Kelly begins smack talking Pam after Darryl beats Jim at ping pong.
　　Season 4, Episode 9: Dinner Party
　　Original Air Date—10 April 2008
　　Michael invites Jim and Pam and Andy and Angela to a couples-only dinner party, which makes Dwight very jealous. However, the only thing he's missing is a ringside seat to witness Michael and Jan's extremely dysfunctional home life.
　　Season 4, Episode 10: Chair Model
　　Original Air Date—17 April 2008
　　Kevin and Andy team up to reclaim the stolen Dunder-Mifflin parking spaces, which forces them into a showdown with the other five bosses of the office park. Meanwhile, Michael becomes fascinated by a women modeling chairs in a catalog.
　　Season 4, Episode 11: Night Out
　　Original Air Date—24 April 2008
　　Michael and Dwight to to New York to party with Ryan, who is having lots of personal and professional problems. The rest of the office employees work late, and wind up getting locked in the business park.
　　Season 4, Episode 12: Did I Stutter?
　　Original Air Date—1 May 2008
　　Michael tries to figure out how to respond to Stanley's insubordination during a meeting, and Dwight buys Andy's vehicle and immediately flips it for more money.
　　Season 4, Episode 13: Job Fair
　　Original Air Date—8 May 2008
　　Dunder-Mifflin participates in a high school job fair, but few students are interested. Jim, Andy, and Kevin play a round of golf with a prospective client. Back at the office, everyone but Dwight and Angela leave for the day.
　　Season 4, Episode 14: Goodbye, Toby
　　Original Air Date—15 May 2008
　　Michael throws an extravagant going-away party for Toby, and falls in love with the woman who is replacing him. Jim plans to propose to Pam at the party, but gets out-staged. Back at corporate, Ryan is arrested for fraud.