Kaio is a Japanese surname.

Kaio may also refer to:

In fiction:

• The Kaiō, gods of the fictional Dragon Ball universe
• The Kaiō-shin, upper-level gods of the fictional Dragon Ball universe
• Michiru Kaioh, a central character of the Sailor Moon meta-series
• Kaioh, a central antagonist in Fist of the North Star

People:

• Chōgorō Kaionji (1901–1977), Japanese author noted for historical fiction novels
• Kaiō Hiroyuki (born 1972), sumo wrestler
• Kaio de Almeida (born 1984), Brazilian swimmer
• Kaio Felipe Gonçalves (born 1987), Brazilian footballer
• Kaio Duarte Costa (born 2005) Taekwondista

• Katie: My Beautiful Face
• Katiena
• Katie Nazer-Hennings
• Katie (New Girl)
• Katie Newman
• Katie Newman Abbott
• Katie Nolan
• Katie Obrien
• Katie O'Donnel
• Katie Ohh
• Katie O’Brien
• Katie Parker
• Katie Paterson
• Katie Pavlich
• Katie Peretti Snyder
• Katie Perkins
• Katie Poirier
• Katie: Portrait of a Centerfold
• Katie: Portrait of a Centrefold
• Katie Powers
• Katie Queen of Tennessee
• Katie Rain Hill
• Katie rain hill
• Katie Rebecca White
• Katie rees