Manisha B. Koirala (born August 16, 1970) is a Nepali-Indian actress who works in Indian films, as well as a UNFPA Goodwill Ambassador and social activist (Activism). Koirala has primarily worked in Hindi cinema, though she has appeared in several Tamil (Tamil language) films as well. She is also an accomplished Bharatnatyam and Manipuri (Manipuri dance) dancer.

Making her acting debut in Nepali movie (Cinema of Nepal) Pheri Bhetaula (1989), Koirala made her acting debut in Bollywood with Subhash Ghais top-grossing drama Saudagar (Saudagar (1991 film)) (1991). She went on to collaborate with some of the most prominent Indian filmmakers of her times, and throughout the 1990s, was one of the best-known actresses in India, mostly recognised for her critically acclaimed performances.

Noted for her portrayals of strong dramatic characters, Koirala mostly ventured into serious and realistic cinema. Although box office collections of her films have varied considerably, critics have noted that her niche as an actor remains unharmed irrespective of box office collections.