The acronym "CSU", when used by itself, can refer to:

• The California State University system
• Colorado State University in Fort Collins, CO.
• The Connecticut State University System
• Channel Service Unit - a WAN equivalent of a network interface card
• a Crime Scene Unit - a group of crime scene investigators who respond to a crime scene.
• Cleveland State University, Ohio
• Christlich-Soziale Union in Bayern - (Christian Social Union in Bavaria)