Tresca may refer to:

• Carlo Tresca (1879–1943), Italian-born American anarchist
• Henri Tresca (1814–1885), French mechanical engineer

• P. S. O'Hegarty
• Psohoh language
• PSO J318.5-22
• P. solani
• Psolidae
• P. Solomon Raj
• Psoloptera aurifera
• Psoloptera basifulva
• Psoloptera leucosticta
• Psoloptera locotmemica
• Psoloptera meisteri
• Psoloptera melini
• Psoloptera thoracica
• Psolus phantapus
• PS One
• PSone Classics
• PS-ON Signal
• Psophia dextralis
• Psophia interjecta
• Psophia napensis
• Psophia obscura
• Psophia ochroptera
• Psophodes leucogaster
• Psophus
• Psophus stridulus