Robin Cassacinamon (c.1620s-1692) was a Pequot Indian governor appointed by the United Colonies to govern Pequots in southeastern Connecticut.
The New England colonies placed Cassacinamon under the authority of colonial ally Uncas of the Mohegan tribe following the Pequot War of 1637. In 1638, Cassacinamon became a servant in the home of John Winthrop, Jr. in Fort Saybrook where he learned English. He served as a translator, and he helped the Pequots to request to be under colonial authority rather than under Uncas. By 1655, the United Colonies appointed him to be governor of the Pequots in settlements at Nameaug (New London, Connecticut) and Noank. Cassacinamon executed Canonchet during King Philip's War, and the colonies commended his service during the war.