Mary Louisa "Mollie" Martin (3 September 1865 – 24 October 1941) was a tennis player from Ireland.

[2] In 1898 she entered the Wimbledon Championships for the first[a] time and, after two wins and two byes, reached the All-comers' final, but was beaten in two sets by Charlotte Cooper.

[5][6] Martin won nine singles titles at the Irish Championships between 1889 and 1903, then considered the second major tennis tournament of the 19th century and was a runner-up three times.

She also won seven singles titles at the Northern Championships, also considered the third major tournament of the period which was held alternately in Liverpool and Manchester.

[2] She was a member of the Fitzwilliam Lawn Tennis Club in Dublin, which staged the Irish Championships.