Marie Trintignant (French pronunciation: [maʁi tʁɛ̃tiɲɑ̃] ^ⓘ; 21 January 1962 – 1 August 2003) was a French film and stage actress. She appeared in over 30 movies during her 36-year career. Her family was deeply involved in France's film industry, as her father was an actor and her mother was a director, producer, and screenwriter.

In 2003, Trintignant began an affair with Bertrand Cantat, the lead singer of French rock band Noir Désir. That same year, Cantat, Trintignant, and Trintignant's mother traveled to Lithuania so Trintignant and her mother could finish work on a television movie. On 26 July 2003, while in their shared hotel room, Cantat flew into a jealous rage during an argument over a text message sent to Trintignant by her husband, from whom she was separated; Cantat proceeded to beat Trintignant severely about the head and face. She died days later from cerebral edema brought about by her injuries. Cantat was convicted of "murder with indirect intent" in her death and received an eight-year prison sentence, of which he served four before his early release. Trintignant's case became a cause célèbre in the discussion of domestic violence and leniency towards perpetrators.

Trintignant was born in Boulogne-Billancourt, the daughter of actor Jean-Louis Trintignant and his second wife, French film director, producer, and screenwriter Nadine Marquand. When Marie's baby sister Pauline died when Marie was nine, she became withdrawn and virtually stopped speaking. Her parents divorced in 1976. Throughout her early life, she was afflicted by severe shyness, but by her mid-teens, she decided to commit to acting. She had a strong affection for animals and considered becoming a veterinarian, but in the end pursued a career in acting.

She first appeared on screen aged four in My Love, My Love, which was directed by her mother and starred her father. Trintignant's first film to generate significant critical acclaim was Série noire, in which she starred alongside Patrick Dewaere.

In 1988, Trintignant worked under French director Claude Chabrol in the film Une Affaire de Femmes, in which she played a young prostitute in wartime Vichy France. Of the role and Chabrol's impact on her career, Trintignant later reflected, "Until then, I had always felt that I was a fraud if I did not go to extremes in showing my characters' pain, but he taught me lightness. He showed me how to grow without false tragedy." She worked with Chabrol again in 1991 on the film Betty, an adaptation of a book by Georges Simenon.

In 1990, Trintignant was involved in a serious car accident which she narrowly survived. The accident hardly impacted the pace of her career, and she starred in 21 films afterwards, including Les Amants du Pont-Neuf in 1991 and Wild Target in 1993, starring alongside Jean Rochefort and Guillaume Depardieu. She starred opposite her then-husband François Cluzet in the 1995 film The Apprentices, and in 1998, she appeared again with Depardieu in White Lies. Two of Trintignant's films were released posthumously: Janis et John, a biographical film directed by her estranged husband Samuel Benchetrit, in which Trintignant starred as Janis Joplin, and Colette, une femme libre, a biographical miniseries in which Trintignant played the lead role of French novelist Colette.

Trintignant stated that she enjoyed portraying marginalized women and tragic heroes on film; she enjoyed playing characters who allowed her to speak "for those who don't deserve being spoken for." She performed in both comedies and tragedies.

Trintignant was the mother of four sons: