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.