Mark Langdon Hill (June 30, 1772 – November 26, 1842) was United States Representative from Massachusetts and from Maine.
He was born in Biddeford (then a part of the Province of Massachusetts Bay) on June 30, 1772.
He attended the public schools, then became a merchant and shipbuilder in Phippsburg.
Hill and John Holmes were the two of the seven representatives from the district of Maine willing to vote for the Missouri compromise, which on a 90-87 vote allowed Maine to become a state at the cost of letting Missouri be a slave state.
His interment was in the churchyard of the Congregational Church in Phippsburg Center.