Optica may refer to:

• Optica (journal), a scientific journal on optics
• Edgley Optica, an aircraft
• Lithops optica, a plant
• Optica Optics Software, software for optical ray-tracing and engineering design

• Kathryn Adams (actress)
• Kathryn Adams (actress born 1893)
• Kathryn Adams (actress, born 1920)
• Kathryn Adie
• Kathryn Ainsworth
• Kathryn Ann Busby
• Kathryn A. Oberly
• Kathryn Augustyn
• Kathryn A. Whaler
• Kathryna Yu-Pimentel
• Kathryn Barger
• Kathryn Barnard
• Kathryn B. H. Clancy
• Kathryn Boor
• Kathryn Bostic
• Kathryn Bouleyn
• Kathryn Bouleyn Day
• Kathryn Bridges Harley Clancy
• Kathryn Bryce
• Kathryn Bullock
• Kathryn Busby
• Kathryn Calhoun Dennis
• Kathryn Chandria Bernardo
• Kathryn Clancy
• Kathryn Clarenbach