| William Henry Wilder | |
| Office1: | Member of the U.S. House of Representatives from Massachusetts |
| Term Start1: | March 4, 1911 |
| Term End1: | September 11, 1913 |
| Constituency1: | (1911–13) (1913) |
| Predecessor1: | John Joseph Mitchell |
| Successor1: | Calvin Paige |
| Birth Date: | 14 May 1855 |
| Birth Place: | Belfast, Maine, U.S. |
| Death Place: | Washington, D.C., U.S. |
| Resting Place: | Crystal Lake Cemetery Gardner, Massachusetts, U.S. |
| Party: | Republican |
| Profession: | Lawyer |
William Henry Wilder (May 14, 1855 - September 11, 1913) was a lawyer and U.S. Representative from Massachusetts.
Wilder was born in Belfast, Maine. He moved to Gardner, Massachusetts, in 1866. He was president of Wilder Industries. He studied law, was admitted to the bar in 1900, and was admitted to practice before the United States Supreme Court in 1909. He studied the monetary systems of Europe in 1909 and wrote many articles and pamphlets on monetary questions.
Wilder was elected as a Republican to the Sixty-second and Sixty-third Congresses and served from March 4, 1911, until his death in Washington, D.C., on September 11, 1913. He is buried at Crystal Lake Cemetery in Gardner.