Thor Nis Christiansen (December 28, 1957 – March 30, 1981) was a Danish-American serial killer from Solvang, California. He committed his first three murders in late 1976 and early 1977, killing young women of similar appearance from nearby Isla Vista. His crimes motivated large demonstrations opposed to violence against women, and in favor of better transportation for the young people residing in Isla Vista. In 1979, he killed a young woman from Los Angeles. A fifth intended victim escaped with a bullet in her head, and later identified him in a Los Angeles bar.