Juan Williams Rebolledo (1825 in Curacaví, Melipilla Province – 24 June 1910 in Santiago), was a Chilean rear admiral who was the organizer and commander-in-chief of the Chilean navy in 1879 at the beginning of the War of the Pacific. As a politician, he was elected from Valparaiso to the national Congress in 1867, and in 1873 he was elected as city councillor.
