Thomas Pettit (1858 – 6 July 1934) was a city councillor and Mayor of Nelson, New Zealand, a baker, temperance advocate, and Baptist.

[4][5] Pettit was elected a member of the city council in August 1902 and as Mayor in 1910.

William Philips had established the soap manufacturing business in 1876 with Haddow and Pettit taking over in 1896.

[9] The association was renamed the Ennerglyn Coal Mining Company[10] with Pettit remaining as a Director.

Pettit was a temperance advocate, a Rechabite and Committee member of the YMCA.