O. princeps may refer to:

• Ochotona princeps, the American pika, a mammal species found in western North America
• Oscillatoria princeps, a cyanobacterium species in the genus Oscillatoria

• Clbuttic problem
• CLBV
• CLC (band)
• CLC discography
• CL class (disambiguation)
• CLC Protocol
• Cl (disambiguation)
• CL discography
• CLDL
• CLDS
• Clea annesleyi
• Clea bocki
• Clea bocourti
• Clea funesta
• CLE Airport
• Cleal, Matthew
• Clean AFPFL
• Clean Air for Europe
• Clean Airwaves Act
• Cleanaway Waste Management
• Clean bandit
• Clean Bandit (group)
• Clean Boating Act of 2008
• Clean Break (New Girl)
• Clean Breaks