Circa or CIRCA may refer to:

• CIRCA, in London
• Circa (band), a progressive rock supergroup
• Circa (company), an American skateboard footwear company
• Circa, an Australian contemporary circus company
• Circa District, Peru
• Circa, a disc-binding notebook system
• Circa Theatre, in New Zealand
• Clandestine Insurgent Rebel Clown Army, a UK activist group
• Circa News, an online news and entertainment service
• Circa Complex, twin skyscrapers in Los Angeles, California
• Circa , 1997
• Circa , 1991
• Circa Resort & Casino, a hotel in Las Vegas