1903 U.S. National Championships – Women's singles

Elisabeth Moore won the singles tennis title of the 1903 U.S. Women's National Singles Championship by defeating reigning champion Marion Jones 7–5, 8–6 in the challenge round. Moore had won the right to challenge Jones by defeating Carrie Neely 6–2, 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 24 through June 27, 1903.