Daniel Marcy (November 7, 1809 – November 3, 1893) was a United States representative from New Hampshire. He was born in Portsmouth, New Hampshire where he attended the common schools. Becoming a sailor, he followed the sea and later engaged in shipbuilding.

Daniel Marcy
Member of the U.S. House of Representatives from New Hampshire's 1st district
In office March 4, 1863 – March 3, 1865
Preceded by	Gilman Marston
Succeeded by	Gilman Marston
Member of the New Hampshire Senate
In office 1857-1858
Member of the New Hampshire House of Representatives
In office 1854-1857
Personal details
Born	November 7, 1809 Portsmouth, New Hampshire, U.S.
Died	November 3, 1893 (aged 83) Portsmouth, New Hampshire, U.S.
Political party	Democratic

Marcy was a member of the New Hampshire House of Representatives 1854–1857. He also served in the New Hampshire Senate in 1857 and 1858. He was an unsuccessful candidate for election to the Thirty-sixth Congress in 1858 and to the Thirty-seventh Congress in 1860. However, he was elected as a Democrat to the Thirty-eighth Congress (March 4, 1863 – March 3, 1865). He was an unsuccessful candidate for reelection in 1864 to the Thirty-ninth Congress. After leaving Congress, he again served in the New Hampshire Senate in 1871 and 1872. He died in Portsmouth in 1893 and was buried in the Proprietors’ Burying Ground.