Thomas Willett (1611-1674) was a British merchant, Plymouth Colony trader and sea-captain, Commissioner of New Netherland,a magistrate of Plymouth Colony, and Captain of Plymouth Colony. He was appointed Mayor of New York on June 12, 1665, by Governor Richard Nicolls, and as a commissioner of admiralty on August 23. He was a member of the governor's executive council from 1665 to 1672 under Richard Lovelace. He retired in 1673.

His son Thomas Willett was a major in the militia of Queens County and a councillor under Governors Sir Edmund Andros and Henry Sloughter.

His great-grandson was Marinus Willett, who served as Mayor of New York from 1807-1808.