Galen was an ancient Roman physician of Greek origin.

Galen may also refer to:

• Galen, Montana, United States, an unincorporated community
• Galen, New York, United States, a town
• Galen Peak, Palmer Archipelago, Antarctica
• Galen (crater), a lunar impact crater

• Galen Catholic College, Wangaratta, Victoria, Australia
• Galen University, San Ignacio, Belize
• Galen College of Nursing, a private nursing school in multiple locations in the United States

• Galen (given name), a list of people and fictional characters
• Galen (surname), a list of people and fictional characters
• Vasily Blyukher (1889–1938), Soviet military commander who used the pseudonym "Galen" while in China
• Phillip Galen, pen name of Ernst Philipp Karl Lange (1813–1899), German novelist

• Galen, a pharmaceutical company renamed Warner Chilcott
• Galen Center, an athletic facility in Los Angeles, California, United States
• Galen Partners, an American healthcare-focused equity investment firm
• Galen Institute, a health policy think tank in Alexandria, Virginia
• Galen, a fictitious town in the novel The Land of Laughs by Jonathan Carroll
• Galen Framework, a software testing framework

• OpenGALEN, a provider of an open source medical terminology
• Von Galen family
• Galan (disambiguation)
• Galena (disambiguation)
• Galien (disambiguation)
• Gehlen (disambiguation)
• Gaylon, a list of people with the given name
• All pages with titles beginning with Galen