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USA High is an American teen sitcom which ran from August 1997 to June 1999, ended after 95 episodes, and reran until August 4, 2001 on USA Network.

Unwrapped, also known as Unwrapped with Marc Summers is an American television program on Food Network that reveals the origins of sponsored foods. It first aired in June 2001 and is hosted by Marc Summers. The show leads viewers on tours of factories and other food-related locations. Popular subjects include candy, breakfast cereal, snacks, and TV dinners. The show's spin-off, Trivia Unwrapped, is a game show also hosted by Marc Summers. Also, beginning in Spring 2015, a new spin-off, Unwrapped 2.0, is scheduled to air.

The Unusuals is a comedy-drama television series that aired on ABC from April 8 to June 17, 2009 in the U.S. and Global in Canada. The pilot and first episode were written by Noah Hawley, a former writer and producer for Fox's Bones. An ABC press release described The Unusuals as "like a modern-day M*A*S*H" that "explores both the grounded drama and comic insanity of the world of New York City police detectives, where every cop has a secret". Its premise elaborated:

Unsolved Mysteries is an American television program, hosted by Robert Stack from 1987 to 2002 and later by Dennis Farina starting in 2008. The show was broadcast first as specials in 1987, then as a regular series on NBC (1988–1997), CBS (1997–1999), Lifetime (2001–2002) and Spike (2008–2010). Lifetime once again airs the revived version of the series, but only in reruns.

United States of Tara is an American television comedy-drama created by Diablo Cody, which aired on Showtime from 2009 to 2011. The series follows the life of Tara (Toni Collette), a suburban housewife and mother coping with dissociative identity disorder.

The Unit is an American action-drama television series that focuses on a top-secret military unit modeled after the real-life U.S. Army special operations unit commonly known as Delta Force. The series originally aired on CBS from March 7, 2006, to May 10, 2009, before being cancelled.

Unhappily Ever After (often shortened to Unhappily... in promotional advertisements) is an American sitcom that aired for 100 episodes on The WB network from January 11, 1995, to May 23, 1999, for a total of five seasons. The series was produced by Touchstone Television.

Unfabulous is an American children's television series that aired on Nickelodeon. The series is about an "unfabulous" middle school student named Addie Singer, played by Emma Roberts. The show, which debuted in late summer 2004, was one of the most-watched programs in the United States among children between the age of 10 and 16 and was created by Sue Rose, who previously created the animated series Pepper Ann and Angela Anaconda.

Undergrads is a Canadian animated television series centered on the lives of four college undergraduate freshmen. Originally broadcast on MTV in 2001, only thirteen episodes were created. It has since been shown on Comedy Central in the United States, Teletoon in Canada, and Trouble in the United Kingdom. The show was conceived by Pete Williams, when he dropped out of college at the age of 19. Willams does most of the voices on the show. The series was produced by David McGrath.

Underdog is an American animated television series that debuted October 3, 1964, on the NBC network under the primary sponsorship of General Mills and continued in syndication until 1973 (although production of new episodes ceased in 1967), for a run of 124 episodes.

Undercover Boss is an American reality television series, based on the British series of the same name and produced by Studio Lambert in both countries. Each episode depicts a person who has an upper-management position at a major business, deciding to go undercover as an entry-level employee to discover the faults in the company. The first season consisted of nine episodes produced in 2009 and first aired on February 7, 2010, on CBS. Companies that appear on the series are assured that the show will not damage their corporate brands.

Kinniku Banzuke (筋肉番付?, lit. Muscle Ranking) a.k.a. Unbeatable Banzuke was a weekly Japanese television program and the premier sports entertainment variety show of the Tokyo Broadcasting System (TBS). Its successors were Taiiku Oukoku (体育王国?, Physical Education Kingdom) and Ougon Kinniku (黄金筋肉?, Golden Muscle). They succeeded by Muscle Musical. Several seasonal specials were also made, such as Pro Sportsman No.1 and Sasuke.

Ugly Betty is an American comedy-drama television series developed by Silvio Horta, which premiered on ABC on September 28, 2006, and ended on April 14, 2010. It revolves around the character Betty Suarez who, despite her lack of style, lands a job at a prestigious fashion magazine. The series is based on Fernando Gaitán's Colombian telenovela Yo soy Betty, la fea, which has had many other international adaptations. It was produced by Silent H, Ventanarosa, and Reveille Productions partnered with ABC Studios and executive produced by Salma Hayek, Silvio Horta, Ben Silverman, Jose Tamez, and Joel Fields. The pilot was filmed in New York; seasons one and two were filmed in Los Angeles and seasons three and four in New York City.

Ghost Hunters is an American paranormal reality television series that premiered on October 6, 2004, on Syfy (previously the Sci Fi Channel). The program features paranormal investigators Jason Hawes and Grant Wilson, who investigate places that are reported to be haunted. The two originally worked as plumbers for Roto-Rooter as a day job while investigating locations at night. Since the show's success, the series now takes precedence in their lives, but they are still honorary employees with the company and continue to do jobs for them if time permits.

UFO Hunters is an American television series that premiered on January 30, 2008 on The History Channel, produced by Motion Picture Production Inc., and ran for three seasons. Jon Alon Walz was the Executive Producer of the show and was responsible for selling the series to History Channel after a bidding war for the rights to the show broke out between History Channel and Sci-Fi Channel (now Syfy).