Mabel Esmonde Cahill (1863–1905) was a female tennis player from Ireland who was active in the late 19th century and was the first foreign woman to win a major tennis tournament when she won the 1891 US National Championships.
Cahill became the first foreign woman to win a major tournament when she defeated Ellen Roosevelt in the 1891 US Championships women's final at the Philadelphia Cricket Club. She successfully defended her women's singles title in 1892 and also won the women's doubles title with Adeline McKinlay and the mixed doubles title with Clarence Hobart. She did not defend her titles in 1893. She died on 1 January 1905 in Ireland.
|Winner||1891||U.S. Championships||Grass||Ellen Roosevelt||6–4, 6–1, 4–6, 6–3|
|Winner||1892||U.S. Championships||Grass||Elisabeth Moore||5–7, 6–3, 6–4, 4–6, 6–2|
|Winner||1891||U.S. Championships||Grass||Emma Leavitt-Morgan|| Ellen Roosevelt
|2–6, 8–6, 6–4|
|Winner||1892||U.S. Championships||Grass||Adeline McKinlay|| Phyllis Walsh
Grace Robert LeRoy
|Winner||1892||U.S. Championships||Grass||Clarence Hobart|| Elisabeth Moore
|This biographical article relating to Irish tennis is a stub. You can help by expanding it.|