Maria Theresa Rosario Garcia Nayve-Israel (born October 3, 1961), known professionally as Rio Locsin, is a Filipino actress.
Known primarily for her roles in films with underlying social themes, she began her career playing daring characters and eventually ventured dramatic roles in the succeeding years, noted for her portrayals in Lino Brocka's Ina, Kapatid, Anak (1979) and Init (1979), Elwood Perez's Disgrasyada (1979), Ishmael Bernal's Manila By Night (1980) & Working Girls (1984) and Laurice Guillen's Kapag Puso’y Sinugatan (1985).
Since then, she was given roles which are sexy like Menor de Edad (1979), Love Affair (1979), Ina, Kapatid, Anak (1979), Rissa Jones (1979), Stepsisters (1979), Waikiki (1980), Disco Madhouse (1980), Manila by Night (1980), Unang Yakap (1980), Kambal sa Uma (1980), Kasalanan Ba (1981), among others.
Other memorable roles were in movies, Salawahan (1979), Working Girls (1984), Soltero (1984), Kailan Tama ang Mali?
As a commercial model, she endorsed, "San-ing" and "Lyna" medicated products, including Bax jeans during the late 70s until early 80s.