Thomas William Mark Ashby JP OBE (23 August 1895 – 26 September 1957) was a New Zealand local body administrator and Mayor of Auckland City from 1956 to 1957.

[1] He served in the Army in the First World War, enlisting in the New Zealand Field Artillery in 1916 and was sent overseas as part of the 16th reinforcements.

In 1920, he joined the Census and Statistics Office and was appointed as the compiler in charge of its local government and finance section.

In the 1951 King's Birthday Honours, Ashby was appointed an Officer of the Order of the British Empire for municipal services.

[4] Having retired as Town Clerk in 1955, he remained engaged in the city's affairs, and in November 1956 successfully challenged the sitting mayor John Luxford, for the role.