Rio de Janeiro is a city in Brazil.

Rio de Janeiro may also refer to:

• Rio de Janeiro (state), a state of Brazil
• Greater Rio de Janeiro, the metropolitan area of the city in Brazil
• A former name for Guanabara Bay
• Rio de Janeiro (Bahia), a river in the Brazilian state of Bahia
• Río de Janeiro (Buenos Aires Metro), a metro station in Buenos Aires
• Protocol of Rio de Janeiro, a 1942 international agreement

• Battle of Rio de Janeiro (disambiguation)
• Rio de Janeiro (ship)