1909 U.S. National Championships – Women's singles

Hazel Hotchkiss won the singles tennis title of the 1909 U.S. Women's National Singles Championship by defeating reigning champion Maud Barger-Wallach 6–0, 6–1 in the challenge round. Hotchkiss had won the right to challenge Barger-Wallach by defeating Louise Hammond 6–8, 6–1, 6–4 in the final of the All Comers' competition. The event was played on outdoor grass courts and held at the Philadelphia Cricket Club in Wissahickon Heights, Chestnut Hill, Philadelphia from June 21 through June 27, 1909.