Mark Richards "M.R." Clapp (March 3, 1803 – April 23, 1891) was an American farmer and territorial legislator.
Born in Boston, Massachusetts, Clapp settled in Milford, Wisconsin Territory in 1840.
Clapp was a farmer.
In 1846, he served in the Wisconsin Territorial Legislature, in the Wisconsin Territorial House of Representatives.
His brother was Joseph Dorr Clapp who served in the Wisconsin State Senate.