"Lecture Circuit" is a two-part episode of the American comedy television series The Office. They constituted the sixteenth and seventeenth episodes of the fifth season and the 88th and 89th overall episodes of the series. The first episode originally aired on NBC on February 5, 2009, and the second on February 12.

During both episodes, Michael and Pam visit the various branches of Dunder Mifflin to make business lectures, and in particular visit the Utica branch – where Jim's ex-girlfriend Karen Filippelli is regional manager, and the Nashua branch, where Michael's ex-girlfriend and the love of his life, Holly is an H.R. rep. In both episodes, Jim and Dwight hit a snag as the new heads of the Party Planning Committee when they forget Kelly's birthday. In the first episode, Andy develops a crush on a customer, and in the second episode, Angela's unhealthy obsession with her cats is spotlighted when she installs a nanny cam.

Both episodes were directed by Ken Kwapis and written by Mindy Kaling, who also plays Kelly Kapoor in the show. "Lecture Circuit" included guest appearances by screenwriter Dan Goor, comedian Rob Huebel and actress Rashida Jones, who reprises her role of Karen, a regular character from the third season. Although the character Holly Flax played a major part in the storyline, actress Amy Ryan did not appear in "Lecture Circuit". The episodes received generally positive reviews. According to Nielsen Media Research, the first part was watched by 8.4 million viewers and the second part was watched by 8.89 million viewers.

Michael Scott is asked to visit the Dunder Mifflin branches to lecture about his success in Scranton. He and Pam Beesly, who is coming along as his assistant and driver, plan to visit every branch except Nashua because Michael is not ready to face his ex-girlfriend Holly Flax, who works there. They first visit the Utica branch, where former Scranton employee Karen Filippelli is now regional manager. Pam, who is engaged to Karen's ex-boyfriend Jim Halpert, fears the encounter will be awkward. However, she is pleasantly surprised upon learning Karen is now married and pregnant, and the two get along very well – when Pam reveals her and Jim's engagement, Karen even offers genuine congratulations. Michael's lecture in Utica proves to be a disaster when he pretends to receive a call saying that his father has died, has Pam throw miniature sized Mounds at the audience, and tries to teach the employees a trick for how to memorize names but ends up insulting everybody. Nevertheless, Pam is ecstatic to have found closure with Karen. Later, on the road, Michael tells Pam that he never found closure with Holly and, at Pam's suggestion, they decide to blow off the other lectures and drive to Nashua to find Holly.

Back in Scranton, Jim and Dwight Schrute have been named the reluctant heads of the Party Planning Committee by Michael due to previous fights between Phyllis Vance and Angela Martin. Jim and Dwight prove terrible at the job, and when an upset Kelly Kapoor chastises them for forgetting her birthday, they try to make it up to her by throwing a party but they do a poor job - Dwight chooses brown and gray balloons (because they "match the carpet") and doesn't blow them up all the way, uses toilet paper as streamers, and his banner simply states "IT IS YOUR BIRTHDAY." Jim does just as poorly when he cannot get anyone to contribute money, forgets Kelly's age, and how to spell her name. Dwight reads her file and learns that Kelly spent time in juvenile hall, but is disappointed to learn it does not affect her job performance.

Andy Bernard finds himself attracted to Julia, a female potential client who is talking with Stanley Hudson. Andy repeatedly acts awkwardly in front of Julia and accidentally sets off her car alarm while trying to look inside and find out what music she likes. After failing to hit on her by singing to the tune of Feist's "1234", Andy admits his attraction to her to Stanley, who then gives the potential client over to Andy in exchange for two of his clients. After walking her out to the car, Andy tries to kiss her, but is immediately rebuked. Andy apologizes and mentions that he just got out of a relationship. Julia claims she also just got out of a relationship and Andy starts feeling a connection, but she still rejects him and he loses the account.

Michael and Pam arrive at the Nashua branch, only to learn Holly is away on a human relations retreat. They also learn Holly is dating one of the Nashua salesmen named A.J. Deeply upset, Michael is at first unable to go forward with the presentation, but Pam tries to comfort him by telling him that she felt the same way when Jim was dating Karen. She encourages Michael to do the best presentation possible so people will tell Holly about it. He starts the presentation, but it falls apart when Michael starts asking A.J. intimate questions about his relationship with Holly. Michael leaves in the middle of the talk, leaving Pam to awkwardly finish the rest of the presentation. When Michael goes to Holly's desk he cuts a sleeve off her sweater, and notices a document on her computer called "Dear Michael", which he copies onto his flash drive. Later, at a diner, Michael tells Pam about the letter, but she insists reading it would be violating Holly's trust. Pam herself reads the letter and deletes it right after. She does not tell him the exact contents, but she reassures him Holly still has feelings for Michael and it is not over, giving an ecstatic Michael the closure he sought.

In Scranton, the party planning continues to go poorly. Dwight publicly and loudly confronts Kelly about her time in juvenile hall, which turns out to be for stealing the boat of an ex-boyfriend when she was 14. Kelly also declares she hates the cake Jim picked for her, which is completely blank; he later decorates it and ends up spelling her name incorrectly as "Kelley". When Kelly insists the party needs a theme, Jim and Dwight are unable to think of anything. Despite a rough start to the party, they finally settle on offering her one hour of napping or one hour of watching television by putting a Chiclet on the cake to represent a pillow or TV. She loves the idea and chooses the nap.