Charles Marsh may refer to:

• Charles Marsh (American politician) (1765–1849), American congressman from Vermont
• Charles Marsh (barrister) (1774–1835), English MP and lawyer
• Charles Marsh (railroad builder) (1825–1876), American railroad builder, instrumental in the transcontinental railroad
• Charles Carroll Marsh (1829–after 1863), American Civil War Union colonel
• Othniel Charles Marsh (1831–1899), American paleontologist
• Charles H. Marsh (1840–1867), American Civil War Union soldier and Medal of Honor recipient
• Charles Dwight Marsh (1855–1932), American botanist
• Charles E. Marsh (1887–1964), founder of the Public Welfare Foundation
• Charles Marsh (1893–1953), American actor who appeared in Cloak and Dagger
• Charles F. Marsh (1903–1984), American economist and educator
• Charles R. Marsh, American professor of religious studies and 2009 recipient of a Guggenheim Fellowship