Doca may refer to:
Cidinho and Doca (in Portuguese Cidinho e Doca, also as Cidinho & Doca) is a Rio de Janeiro-based Brazilian rap duo made up of Sidney da Silva (MC Cidinho) and Marcos Paulo de Jesus Peizoto (MC Doca), two prominent proibidão rappers.
Proibidão refers to songs whose airplay is legally prohibited [in Brazil] due to alleged crime apology and promotion of drugs and arms usage. The duo are famous internationally for their rendition "Rap das Armas" (English: Rap of Weapons), a 1990s song originally by Junior e Leonardo, a song that also appeared on the soundtrack of the film Elite Squad (in Portuguese Tropa de Elite), the highest-grossing film of 2007 in Brazil.
The song illustrates the daily invasion of favelas by the elite squad of the Brazilian police in order to fight crime and drug trafficking. Despite its popularity, "Rap das Armas" was never played on the Brazilian radio and was removed from the film's soundtrack album two weeks after its release, because it allegedly praises fireweapons and lawlessness.
Alfredo "Doca" de Almeida Rego (born 7 April 1903, date of death unknown) was a Brazilian football player. He played for the Brazil national team.