Un gars, une fille (French pronunciation: [œ̃ ɡɑ yn fij], A Guy, A Girl) is a Canadian comedy television series created by and starring Guy A. Lepage and broadcast on Radio-Canada, as well as the title of its French adaptation on France 2. It was one of the most successful television shows in the province of Quebec, with a concept exported to more than thirty markets around the world. It was the first French-language Canadian television programme to be adapted in the United States.

The show spawned several international versions, most notably a French TV series of the same name, which characters appeared in a 1999 episode of the original series, "À Paris".

A typical episode features several vignettes of the everyday life of a couple, with the camera mostly centred on them. Often other characters are cropped, giving the programme its unique visual style. The couple receives friends for supper, go to the convenience store, or leave on a trip, and sometimes get on each other's nerves. Their quirks, and loving bickering, provide much of the program's humour. The graphic design style associated with the original Un gars, une fille, which consists of a palette of pastel blue and pink, and rough lines and scribbles, as well as a logo with simulated printing mistakes and smears, has been imitated by most of the other versions, with the notable exception of the American version. The character names are often those of the actors, as in the first version.

The concept of Un gars, une fille began in the 1990s as a series of short segments featured on Besoin d'amour, a TQS network daily talk-show, hosted by Guy A. Lepage that ran from 1995 to 1996. Lepage, a veteran of the renowned comedy troupe Rock et Belles Oreilles (RBO), played one half of the couple along with Sylvie Léonard. The duo reprised their roles in what became Un gars une fille in 1997, a successful weekly 26-minute programme which spawned many adaptations. It was celebrated numerous times at awards presentations, notably winning the Gémeaux, Félix, and MetroStar Awards. It was also nominated twice at the American Emmy Awards. Produced by Avanti Ciné Vidéo, the show aired from 1997 to 2003 in its initial run, and continued in reruns afterward. 130 episodes were produced, which included about 4,000 scenes. The scriptwriting team included RBO members André Ducharme and Bruno Landry, as well as Sylvie Léonard herself. Yves P. Pelletier, also from RBO, has been featured onscreen. After the series concluded in 2003, Lepage went on to produce and host the hugely successful Tout le monde en parle, adapted from the eponymous French hit talk-show.

A standard episode is presented in three acts, each of which is split into five to seven scenes. Flashy pastel blue and pink graphics with squiggly lines follow punchlines and mark transitions, coupled with an upbeat percussive tune, and often a spoken Voice-over phrase summing up the previous segment. Appropriately, the show's publicity, and early video release covers, are often recognisable by the presence of those pastel blue and pink colours and askew lines, mimicking the graphics that separate the programme's scenes; traditionally, the colour blue is associated with boys and pink with girls.

The two main characters, "Guy et Sylvie", are named after the actors who play them. Guy likes to tease Sylvie on a variety of subjects and hates her mother. His father is remarried to a young, good-looking stripper, Mélanie, played by Mahée Paiement, and had a child with her. The attention the child receives makes Guy jealous, his father having spent little time with him when he was a child. Unlike Guy, Sylvie dreams of having a baby. She is jealous of Geneviève, Guy's sexy, and promiscuous, office colleague with whom he had a one-time affair years ago. She is also obsessed with cleanliness and resents Guy for being untidy. A curious running gag from the show involves Guy surprising Sylvie by grabbing her breasts from behind while shouting "Road Runner!", followed by the cartoon character's emblematic honking "beeb beeb" sound. While she ostensibly loves it, she pretended the exact opposite when it was obliquely brought up by Guy in front of her mother. This joke was developed on the set by the two actors. The last season saw notable developments: a marriage, and a trip to Vietnam to adopt a little girl.

An Albanian version named Tenxherja-Kapakun (The Pot, the Lid) is produced by Top Channel with Urbanus Group, with half-hour episodes revolving around the main characters Bela (Elvana Gjata) and Romi (Romeo Veshaj). The series began airing on October 5, 2024.

The Bulgarian version, known as Тя и той (She and He) aired from 2002 to 2005 on bTV. In 2007, the show moved to Foxlife and the fourth season began airing. The show was cancelled after the final (25th) episode of the season, ending with a cliffhanger. 96 episodes were produced during the show's Bulgarian run. Since then reruns are airing on Foxlife and bTV Comedy. Stefaniya Koleva stars as Sylvia, and Yulian Vergov plays Martin.^{[citation needed]}