Valli Valli, born Valli Knust (11 February 1882 – 4 November 1927), was a musical comedy actress and silent film performer born in Berlin, Germany. She was descended from an old English family and lived most of her life in England. Her brother was a captain in the Royal Fusiliers, who fought for the British in France in World War I. Her sisters Lulu (1887–1964) and Ida were both actresses, who used the stage names Lulu Valli and Ida Valli. Her brother-in-law, Philip Curtiss (Ida's husband), wrote Mummers in Mufti in 1921. She also had a brother named Cyril Knust.
Valli was educated in London and Paris. As a twelve-year-old, she made her first stage appearance in Gentle Ivy (1894) at Terry's Theatre in London. She demonstrated her theatrical skill in Berlin in 1895 with a successful run in the musical comedy Morocco Bound. She returned to London's Drury Lane Theatre, performing the role of the dancing doll in a pantomime version of Cinderella the following Christmas.
A strikingly beautiful woman, Valli played mostly in England thereafter, appearing in The Queen of Hearts, Purple Road and The Duke's Motto, among other pieces. She toured the United States a number of times. Her first American tour was in the operetta Veronique in 1905, where she played the part of Sophie. In London in 1907, when she played Polly Love in a revival of The Christian at the Lyceum Theatre. She appeared in 1908 in the London musical Kitty Grey. This was followed the next autumn by an appearance in the long-running American version of The Dollar Princess (1909). Valli had the role of Alice Cowder. In 1916, she participated in George M. Cohan's The Cohan Revue. Her last New York City performance was in Miss Millions in 1919 at the Punch and Judy Theatre.