1890 U.S. National Championships – Women's singles

Ellen Roosevelt won the singles tennis title by defeating reigning champion Bertha Townsend 6–2, 6–2 in the Challenge Round of the 1890 U.S. Women's National Singles Championship in front of a crowd of nearly 2,000 people. Roosevelt had won the right to challenge Townsend by defeating Lida Voorhees 6–3, 6–1 in the final of the All Comers' competition. The event was played on outdoor grass courts and held at the Philadelphia Cricket Club in Chestnut Hill, Philadelphia from June 10 through June 13, 1890.