Evalyn Knapp (born Evelyn Pauline Knapp; June 17, 1906 – June 12, 1981) was an American film actress of the late 1920s, 1930s and into the 1940s. She was a leading B-movie serial actress in the 1930s. She was the younger sister of the orchestra leader Orville Knapp (1904–1936).
In 1931, Knapp spent several months in the hospital after she fell from a cliff during a hike with her brother, Orville. Two vertebrae were fractured.Her brother, orchestra leader Orville Knapp, died in a plane crash while piloting the plane in 1936, smashing into the runway. He was 32 years old.Her brother was married to film actress Gloria Grafton (1909–1994).She married Dr. George A. Snyder in 1934.Following her retirement, she concentrated on her family. She and Snyder remained married until his death in 1977. On June 12, 1981, Knapp died of heart disease at St. Vincent's Hospital in Los Angeles, California.