Casselman may refer to:

Places

• Casselman, Pennsylvania, a borough in Somerset County, Pennsylvania
• Casselman, Ontario, a village in eastern Ontario
• Casselman-Steele Heights, Edmonton, a residential area located in northeast Edmonton, Alberta, Canada.
• Casselman, Edmonton, a residential neighbourhood located in northeast Edmonton, Alberta, Canada.
• Casselman River, a tributary of the Youghiogheny River in Pennsylvania
• Casselman Formation, a sedimentary bedrock unit in Pennsylvania and Maryland

People

• Amos Casselman (1850-1929), an American archer
• Arthur Allen Casselman (1902-1974), a Canadian politician
• Arza Clair Casselman (1891-1958), an Ontario lawyer and political figure
• Cora Taylor Casselman (1888-1964), a Canadian federal politician
• Frederick Clayton Casselman (1885-1941), a Canadian federal politician
• Mike Casselman, a retired Canadian professional ice hockey player
• Orren D. Casselman (1861-1950), an Ontario merchant and political figure
• William Allen Casselman, a Canadian mathematician
• William Gordon Casselman, a Canadian writer and broadcaster
• William H. Casselman (1868-1941), an Ontario farmer and political figure