Twins of Evil (also known as Twins of Dracula) is a 1971 British horror film directed by John Hough and starring Peter Cushing, with Damien Thomas, real-life identical twins former Playboy Playmates Madeleine and Mary Collinson, Isobel Black, Kathleen Byron, Damien Thomas and David Warbeck. This was the Collison sisters' final acting roles.

It is the third (and final) film in the Karnstein Trilogy, based on the 1872 novella Carmilla by Sheridan Le Fanu. The film has the least resemblance to the novella and adds a witchfinding theme to the vampire story. Much of the interest of the film revolves around the contrasting evil and good natures of two beautiful sisters, Frieda and Maria. Unlike the previous two entries in the series, this film contains only a brief lesbian element.

The film was released in the U.S. as a double feature with Hands of the Ripper.