John Clark (February 1, 1761 – August 14, 1821) was an American farmer and politician from Blackbird Hundred in New Castle County, Delaware, near Smyrna. He was a member of the Federalist Party, who served in the Delaware General Assembly and as Governor of Delaware.

Clark was born February 1, 1761 at "New Bristol" in what is now Blackbird Hundred, New Castle County, just north of Smyrna, Delaware, son of William Clark. In 1784 he married Sarah Cook Corbit, daughter of Governor John Cook, and had a least one child, Mary. They lived at Clearfield Farm in what is now Blackbird Hundred in a house since used as an administrative office for the correctional facility located there. He was a member of the Presbyterian Church.

Elections were held the first Tuesday in October. Members of the Delaware General Assembly took office in the first Tuesday of January. State Representatives had a term of one year. The Governor takes office the third Tuesday in January, and had a three year term.