Fernando de Quintanilha e Mendonça Dias GCC, TO, ComA, GOA, GCA, MPBS, MOBS, GOI, GOIH, ECMM (Chaves, November 15, 1898 - Lisbon, São Vicente de Fora, June 9, 1992) was a member of the Portuguese Navy, and a political and colonial administrator during the Estado Novo and Minister of the Navy from 1958 to 1968.
In this role he was instrumental in the creation of the Hydrographic Institute.
In 1947, following the independence of the Indian Union, he played an important role in the defense of Goa against the economic blockade that was imposed by leaders of neighboring Indian states.
He was also general-governor of the Portuguese State of India (Estado da Índia) from 1948 to 1952.