Mario Fermín Cabral y Báez (b. 1877, Baní – d. 1961, Santo Domingo) was a politician from the Dominican Republic. He was Senator for the Province of Santiago, and also the President of the Senate of the Dominican Republic three times: 1914–1916, 1930–1938, and 1955.^[1]

During his tenure as senator he drafted the bill that in 1935 renamed the Dominican capital, Santo Domingo, Trujillo City in honour of dictator Rafael Trujillo;^[2][3] he also promoted in 1943 the construction of Centro de Los Heroes in the capital city.

Cabral y Báez was the son of Marcos Antonio Cabral y Figueredo and Altagracia Amelia Báez Andújar (daughter of President Buenaventura Báez). On 24 November 1900, Cabral y Báez married Amelia Josefa Tavares Saviñón and they had four children: María Estela, Pura Amelia, Manuel Antonio and Ramón Cabral Tavares. After his first wife died, Cabral y Báez married María Josefa Tavares Tineo and they had one daughter, Altagracia Amelia Cabral Tavares. With Sixta América Stéfani, an Italian-Dominican, he had another daughter, Dulce Enilda Altagracia Cabral Stéfani (1925–2008).