Night Court

The judge

• Harry Anderson, as Judge Harold "Harry" T. Stone, is a young, good-humored jurist and amateur magician whose parents are former patients of a mental health institution. He is 34 years old as of his swearing-in, making him the youngest serving judge at the time. The outgoing mayor had made appointments to fill a large number of judicial vacancies on his last day in office, a Sunday, and Harry was the only appointee of the entire group who was at home that day to answer a telephone call from the mayor's office and accept the position. He loves old movies, is vocal in his disdain for modern music (especially Barry Manilow), and idolizes actress Jean Harlow and crooner Mel Tormé, both of whose photographs he displays in his chambers.

The public defenders

• Gail Strickland as public defender Sheila Gardner (pilot episode only).
• Paula Kelly as Liz Williams (season 1 only).
• Ellen Foley as Billie Young (season 2 only), a public defender and potential romantic interest for Stone during season 2.
• Markie Post as Christine Sullivan (seasons 3–9): Her first appearance on the show was an early second-season episode ("Daddy for the Defense", originally aired October 4, 1984); she did not become a regular until the third season. (Post was a regular in a supporting role in The Fall Guy at the time.) Honest to a fault and somewhat naïve, she is the primary romantic interest for Stone and a regular target for Dan Fielding's lechery. She has various Princess Diana memorabilia collections such as a set of porcelain thimbles, as she is a huge fan of the British royal family.

The prosecutor

• John Larroquette, as Reinhold Daniel Fielding Elmore, using the name Daniel R. "Dan" Fielding (although in the season 2 episode "Harry on Trial", he is referred to as Daniel K. Fielding), is a sex-obsessed narcissistic prosecutor, who would do almost anything to get a woman to sleep with him. It is hinted that he frequents dominatrixes. He is the source of many witty and sometimes cruel remarks about almost every other character, although he does have a compassionate side as well. When his homeless lackey Phil dies, the ever-greedy Dan is excited to discover that Phil is in fact wealthy and expects to be the beneficiary of his millions, only to learn that Phil's family will put Dan in charge of the Phil Foundation, tasked to give away Phil's entire fortune to worthy causes. Dan reveals near the end of the third-season episode number 22 "Hurricane (Part 2)" that his real first name is Reinhold (a reference to the show's creator/writer/producer of the same name), and that he began using the name Dan out of embarrassment when he started school. The other characters are not aware of Dan's true name until the fifth-season episode "Dan, the Walking Time Bomb". It is discovered earlier in the series—second-season episode "Dan's Parents"—from Dan's parents Daddy-Bob (John McIntire) and Mucette (Jeanette Nolan), that he is using his middle name Fielding as a last name since he went to college because he believes it sounds better for a lawyer and because he is embarrassed by his impoverished childhood. He reveals in the episode "No Hard Feelings" that he received his Juris Doctor degree from the Bayou Institute of Law & Agriculture, whose mascot is the "Fighting Sow-belly." During the eighth season, he is revealed to have a successful younger sister named Donna, whose morals and life goals are similar to his own.

The bailiffs

• Richard Moll, as Nostradamus "Bull" Shannon, is a seemingly dim-witted hulk of a figure, is actually patient, gentle and childlike. Although he is portrayed as dull and dim, he is actually a highly intelligent person with an IQ of 181. He is fiercely protective of Harry. Bull is known for his catchphrase, "Ooo-kay", and for clapping a hand loudly to his scalp when he realizes he had made a mistake. Moll had been filming a sci-fi movie (Metalstorm) and had shaved his head for the role. The producers loved the look and Moll kept his head shaven for the entire run of the series.
• Selma Diamond, as Selma Hacker (seasons 1 & 2), is a chain smoking (like the actress who played her) older bailiff. In one episode, she admits to having had six husbands, one of whom is a contortionist. Diamond died of lung cancer shortly after season 2; her character's death is acknowledged on a subsequent episode.
• Florence Halop, as Florence "Flo" Kleiner (née Nightingale) (season 3 only), is Selma's replacement. She is similar in age and personality to Selma, but loves motorcycles and heavy metal music. Halop died shortly after season 3, also of cancer like Diamond. In the opening episode of season 4, Harry Stone acknowledges that Florence Kleiner has died.
• Marsha Warfield, as Rosalind "Roz" Russell (seasons 4–9), the third bailiff, a tall, tough, taciturn, no-nonsense woman. She usually projects a fearsome, standoffish image. Sharp-tongued, in time she becomes close to her coworkers. Warfield stays on the show for the rest of its run.

The court clerks

• Karen Austin, as Lana Wagner (season 1), is the original romantic interest for Harry Stone, despite being engaged. Although Austin was asked to leave the show after 10 episodes,[1] she was seen in the opening credits of all 13 first-season episodes.
• Charles Robinson, as Macintosh "Mac" Robinson (seasons 2–9), is a Vietnam War veteran. He is easy-going and pragmatic, has a good sense of humor—frequently having the last laugh at Dan—and is a loyal friend to his coworkers. He always wears a cardigan, plaid shirt, and knit tie. By the end of the series, he leaves his job to pursue his dream of going to film school and becoming a director.

• Mike Finneran, as Art Fensterman, the bumbling maintenance man at the courthouse. His attempts to work on the courthouse often disrupt Harry's proceedings in the courtroom.
• Martin Garner, as Bernie (seasons 1–3), the operator of the concession stand in the cafeteria, who has a crush on Selma and often tries to persuade her to stop smoking. After Selma dies, he attempts to court Flo.
• Terry Kiser, as Al Craven (seasons 1 & 2), an obnoxious tabloid reporter who sometimes hangs around the courtroom in hopes of discovering a scandalous story.
• Jason Bernard, as Judge Willard (seasons 1 & 2), an arrogant, humorless judge who does not approve of Harry's antics and tries to have him removed from the bench.
• Rita Taggart, as Carla Bouvier (seasons 1 & 2), more commonly known as "Carla B", a prostitute who frequently appears as a defendant and who has a crush on Harry.
• Ron Ross, as Dirk, a wimpy bailiff.
• Denice Kumagai, as Quon Le Duc Robinson (seasons 2–9), Mac's wife, a refugee from Vietnam, where she meets Mac during his service in the Vietnam War when her family lets Mac stay at their home while injured. Quon Le is naïve about America and its customs, but is loving and devoted to Mac. Mac originally marries her to keep her in the country, claiming he is not in love with her, but that quickly changes. She does not understand the concept of "buy now, pay later" but becomes more financially responsible after opening a restaurant in season 3. In season 4, moments after being sworn in as an American citizen, Quon Le gives birth to daughter Renee Flicka Robinson, who is named after Quon Le's favorite television show as a child, My Friend Flicka.
• John Astin, as Buddy Ryan (seasons 3–9), Harry's eccentric biological father and a former patient in a psychiatric hospital. His catchphrase is the capper to stories involving his hospital stay or past strange behavior: "...but I'm feeling much better now," accompanied by a huge leering grin. He later admits to being Harry's biological father but he kept it secret for fear that the truth would hinder Harry's judicial career.
• Mel Tormé, as himself, is almost fanatically admired by Judge Stone. The two periodically cross paths, but Tormé tends to become irritated with Harry due to the latter's unintended causation of misfortune. Tormé played Harry's guardian angel in a season 8 episode modeled after the film It's A Wonderful Life, where the angel shows Harry how his colleagues could have ended up had he never become a judge.
• William Utay, as Phil Sanders, Dan's homeless lackey. Later in the series, Phil is killed in an accident involving a piano. Just before his death, Phil is revealed as actually extremely wealthy, but chose to live among the poor (a former stockbroker suffering from Howard Hughes syndrome). The show suggests the New York Harmonic Orchestra was known as the "PHILharmonic Orchestra" because Phil is one of its greatest patrons. Utay later played Phil's evil twin brother Will, who befriends Dan to steal all of the Phil Foundation's money. Will later returns what he had stolen along with additional cash from successful investing, and devoted the rest of his life to doing good deeds on Dan's behalf.
• Brent Spiner and Annie O'Donnell as Bob and June Wheeler, a pair of down-on-their-luck stereotypical Appalachian yokels; although, they admit they are Yugoslavian, but they continue to speak the same way. Bob is a frequent defendant in Harry's courtroom, usually as the result of a series of freak disasters befalling his family. At one point, they run a concession stand in the courthouse, for which they spend the entire inheritance ($250,000), that "Granny" (oft-mentioned but never seen) had left them, forcing them to charge astronomical prices.
• Leslie Bevis, as Sheila, an exotic nymphomaniac who often appeared to entice Dan into dangerous sexual liaisons during or after court to his detriment, causing him to go into a coma in one episode.
• Yakov Smirnoff, as Russian immigrant Yakov Korolenko. In the first season, Harry saves a distraught Yakov from a suicide attempt, and they became friends. Yakov eventually tries to bring his brother to America, succeeds in getting his wife Sonja and kids out of the Soviet Union, and gets his father to immigrate after the Cold War ended. Although Yakov's role was largely humorous, a few episodes were more serious, such as fighting the refusenik status of his wife and children, or where Yakov's father argues with Yakov about forgetting his roots.
• Eugene Roche, as Jack Sullivan, Christine's overbearing father. He refers to Harry as "that nut".
• Dan Frishman as Dan's boss, District Attorney Vincent Daniels. Though Dan initially underestimates him because he is a little person, he has an extremely tough personality and often has it in for Dan.
• Bumper Robinson, as Leon, an orphan who becomes close to Harry. He first appears in season 2 as a shoeshine boy, who is always after Dan to pay for the shine. In season 3, he becomes Harry's temporary foster son before getting adoptive parents, whom he sees as geeks. Unsatisfied with the parents, he runs away after a confrontation with Harry, where he says that he wished Harry was his father from the start. He returns for one episode in season 4, in which Harry scares Leon into rejoining the foster program.
• Ray Abruzzo, as Tony Giuliano (seasons 7-8), a police detective and Christine's fiancé, husband, and then ex-husband.
• Mary Cadorette, as Margaret Turner, a newspaper reporter who became Harry's girlfriend/fiancée during season 8. The couple broke up towards the end of the season due to Margaret being forced into the witness relocation program after testifying in court about a mob hit she had witnessed.
• S. Marc Jordan, as Jack Griffin (seasons 8–9), the blind operator of the concession stand in the cafeteria.
• Joleen Lutz, as Lisette Hocheiser (seasons 8–9), the ditzy court stenographer.
• Gilbert Gottfried, as Oscar Brown (season 9), an attorney who filled in for Dan.
• Florence Stanley, as Judge Margaret Wilbur, who occasionally filled in for Harry. She does not tolerate the staff's eccentricities. (Wilbur was a cross-over character from the NBC situation comedy, My Two Dads, where Bull Shannon had made guest appearances in two episodes.)

The only actors to appear consistently throughout the show's run were Anderson, Larroquette, and Moll.

After its primary run in broadcast syndication, the series aired on A&E Network for many years. It then aired on TV Land from 2005 to 2008, then began airing on Encore Classic on December 2, 2013. From 2016 to 2021, the show aired on Laff.[14]

As of March 2023, the series airs on the Weigel Broadcasting owned Catchy Comedy network weeknights.[15] The series was also the subject of Catchy Comedy's inaugural weekend "Catchy Binge" on April 1–2, 2023.

Network Ten first broadcast the series in the 1980s and 1990s. 7TWO began showing reruns in June 2011.

Aired weekdays on both Comedy Gold and JoyTV.

Sat.1 aired the series as Harry's wundersames Strafgericht (Harry's Miraculous Criminal Court) in 1988.

Italia 1 aired the show as Giudice di notte (Night Judge) from 1986 until 1988.

TVE aired the show as Juzgado de Guardia (Court on Duty/Call).

The show screened weekly on TVNZ 1 in the 1980s and 1990s, and was rerun in the late 1990s.