GCSU or Georgia College & State University is a public university in Milledgeville, Georgia.

GCSU may also refer to:

• GCSU Sri Lanka, the Government Clerical Service Union in Sri Lanka.
• Grenfell Campus Student Union, the students' union for the Grenfell Campus of Memorial University in Corner Brook, Newfoundland and Labrador.
• Glendon College Student Union, the students' union for the Glendon College campus of York University in Toronto, Ontario.

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