1891 U.S. National Championships – Women's Singles
| Women's Singles | |
|---|---|
| 1891 U.S. National Championships | |
| Champion |
 Mabel Cahill |
| Runner-up |
 Ellen Roosevelt |
| Final score | 6–4, 6–1, 4–6, 6–3 |
| Draw | 8(+CR) |
| Seeds | – |
Mabel Cahill won the singles title by defeating reigning champion Ellen Roosevelt 6–4, 6–1, 4–6, 6–3 in the Challenge Round of the 1891 U.S. Women's National Singles Championship. Cahill had won the right to challenge Ellen Roosevelt by defeating her sister Grace Roosevelt 6–3, 7–5 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 23 through June 27, 1891.
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