Caio is a Portuguese masculine given name derived from the Latin name Gaius. People with that name include:
Antônio Caio da Silva Sousa, a Brazilian footballerCaio Alves, a Brazilian footballerCaio César, a Brazilian voice actorCaio Ribeiro, a Brazilian footballerCaio Blat, a Brazilian actorCaio Canedo Corrêa, a Brazilian footballerWolnei Caio, a Brazilian footballerCaio Zampieri, a Brazilian professional tennis playerCaio Bonfim, a Brazilian racewalkerCaio Ibelli, a Brazilian professional surferCaio Torres, a Brazilian professional basketball playerCaio Prado Júnior, a Brazilian historian, geographer, writer and politicianCaio Fernando Abreu, a Brazilian writerCaio Castro, a Brazilian actorCaio Koch-Weser, a German politicianCaio Lucas Fernandes, a Brazilian footballerCaio Magalhães, a Brazilian professional mixed martial artistCaio Mendes, a Brazilian footballerCaio Blinder, a Brazilian journalist, writer and TV presenterCaio Canedo Corrêa, a Brazilian footballerCaio Souza, a Brazilian artistic gymnastCaio De Cenco, an Italian footballerCaio Domenico Gallo, an Italian historianCaio Danilo Laursen Tuponi, a Brazilian footballerCaio Rangel, a Brazilian footballerCaio Fonseca, an American painterCaio Henrique Siqueira Sanchez, a Brazilian footballerCaio Japa, a Brazilian futsal playerCaio Júnior, a Brazilian football managerCaio Pizzoli, a Brazilian ten-pin bowlerCaio Secco, a Brazilian footballerCaio Terra, a Brazilian practitioner of Brazilian jiu-jitsuCaio Vianna Martins, a Brazilian scout