Isabelle Anne Madeleine Huppert (French: [izabɛl ypɛʁ]; born 16 March 1953) is a French actress. Described as "one of the best actresses in the world", she is known for her portrayals of cold and disdainful characters devoid of morality. She is the recipient of several accolades, including two César Awards, five Lumières Awards, a BAFTA Award, three European Film Awards, two Berlin International Film Festival, three Cannes Film Festival and Venice Film Festival honors, a Golden Globe Award, and an Academy Award nomination; in 2020, The New York Times ranked her second on its list of the greatest actors of the 21st century.

Huppert's first César Award nomination for Best Supporting Actress was for Aloïse (1975). She won the BAFTA Award for Most Promising Newcomer for The Lacemaker (1977). She went on to win two Cannes Film Festival Awards for Best Actress for Violette Nozière (1978) and The Piano Teacher (2001). She received the Volpi Cup for Best Actress twice for Story of Women (1988) and La Cérémonie (1995). Huppert's other films in France include Loulou (1980), La Séparation (1994), Gabrielle (2005), Amour (2012), Things to Come (2016), and Happy End (2017).

Huppert earned her first Academy Award for Best Actress nomination for her role in Elle (2016). Huppert is among international cinema's most prolific actresses. Her English-language films include Heaven's Gate (1980), The Bedroom Window (1987), I Heart Huckabees (2004), The Disappearance of Eleanor Rigby (2013), Louder Than Bombs (2015), Greta (2018), Frankie (2019), and Mrs. Harris Goes to Paris (2022).

Also a prolific stage actress, Huppert is the most nominated actress for the Molière Award, with nine nominations; she received an honorary award in 2017. In the same year she was awarded the Europe Theatre Prize. She made her London stage debut in the title role of the play Mary Stuart in 1996, and her New York stage debut in a 2005 production of 4.48 Psychosis. She returned to the New York stage in 2009 to perform in Heiner Müller's Quartett, and in 2014 to star in a Sydney Theatre Company production of The Maids. In 2019, Huppert starred in Florian Zeller's The Mother at the Atlantic Theater Company in New York.