Helene Costello was an American motion picture actress, most notably of the silent film era.
Lou Costello took his professional name from the actress.
Born in New York City, New York, USA she was the daughter of the prominent stage and pioneering film actor Maurice Costello and his actress wife Mae Costello and the younger sister of actress Dolores Costello. Helene first appeared onscreen in the 1909 film adaptation of Victor Hugo's Les Misérables. She would continue acting in films throughout the 1910s as a child actor and reach her peak of public popularity in the 1920s, although never quite rivalling the success of her sister Dolores.
Although she had been appearing onscreen since her early childhood, in 1927 Helene Costello was selected as a WAMPAS Baby Star, a promotional campaign sponsored by the Western Association of Motion Picture Advertisers in the United States, which honored thirteen young women each year who they believed to be on the threshold of movie stardom.