Bishop Mariano Vivanco Valiente (3 April 1933 in San Antonio de los Baños, Cuba – 23 August 2004 in Matanzas, Cuba) was Bishop of the Roman Catholic Diocese of Matanzas (1987–2004).
He studied humanities, philosophy and theology at El Buen Pastor Seminary in Havana.
He was appointed Bishop of Matanzas on May 18, 1987, by Pope John Paul II and consecrated on June 29, 1987, in the Cathedral of Havana by Mons.
Jaime Lucas Ortega y Alamino, Archbishop of the Archdiocese of Havana assisted by Mons.
Pedro Claro Meurice Estiu, Archbishop of the Archdiocese of Santiago de Cuba and Mons.