Juan Larrea (June 24, 1782 in Catalonia, Spain – 1847 in Buenos Aires) was a Spanish businessman and politician in Buenos Aires during the early nineteenth century. He headed a military unit during the second British invasion of the Río de la Plata, and worked at the Buenos Aires Cabildo. He took part in the ill-fated Mutiny of Álzaga. Larrea and Domingo Matheu were the only two Spanish-born members of the Primera Junta, the first national government of Argentina.