Captain Joseph Thomas (1803–?) was a British explorer and the chief surveyor for Lyttelton, Sumner and Christchurch in New Zealand. He took up surveying after service in the British army, gaining the rank of lieutenant. In the 1840s, he explored many parts of New Zealand and worked for the New Zealand Company. This gained him employment with the Canterbury Association, which sent him to New Zealand in 1848. Thomas' role was to find a suitable site for their proposed settlement, and what became the Canterbury region with Christchurch as its capital was the result of his efforts. He was dismissed in early 1851 over quarrels with John Robert Godley, the agent of the Canterbury Association, just after the first settlers had arrived in the colony. Thomas' life after 1853 is unknown. Having allowed for Hagley Park as a generous central city green space is regarded as his major achievement, and it is his lasting legacy.

Lyttelton is a port town on the north shore of Lyttelton Harbour / Whakaraupō, at the northwestern end of Banks Peninsula and close to Christchurch, on the eastern coast of the South Island of New Zealand.