Dr Thomas Renwick (1818 – 28 November 1879) was an early New Zealand settler in the Nelson and Marlborough regions.

On 26 May 1842, he sailed as a ship's doctor on the Thomas Harrison to Nelson as part of the New Zealand Company's settlement scheme.

[3] They arrived in Nelson on 25 October 1842, with two children having died on the voyage (which is considered a low death rate).

[4] It is believed that Renwick helped the Chinese-born Appo Hocton, who had also arrived on the Thomas Harrison, get off a jail term.

His wife was wealthy and this allowed Renwick to purchase land in the Awatere Valley in Marlborough.

[5] In 1855, he bought 4,800 hectares (12,000 acres) of land in the Waihopai Valley from the estate of Constantine Dillon.

[9] When Renwick returned from his first visit to London, he was appointed to the New Zealand Legislative Council from 15 October 1863 to 28 November 1879, when he died.