Twice Upon a Time is a 1953 British comedy film directed by Emeric Pressburger and starring Hugh Williams, Elizabeth Allan, Yolande Larthe, and Charmian Larthe. Based on the 1949 book Lottie and Lisa by Erich Kästner. It concerns twin sisters who are separated when their parents divorce. They meet again by accident when they are sent to the same summer camp, and they hatch a plan to reunite their parents.