| Carlos Modesto Piedra | |
| Office: | President of Cuba |
| Term Start: | January 2, 1959 |
| Term End: | January 3, 1959 |
| Predecessor: | Anselmo Allegro |
| Successor: | Manuel Urrutia |
| Birth Place: | Spanish Cuba |
| Death Place: | Havana, Cuba |
| Nationality: | Cuban |
| Spouse: | Maria Luisa Martinez Diaz |
| Children: | Isis, Flavia |
| Profession: | Attorney; Judge, Cuban Supreme Court |
Carlos Manuel Piedra y Piedra (or Carlos Modesto Piedra y Piedra) (1895–1988) was a Cuban politician who served as the Interim President of Cuba for a single day (January 2–3, 1959) during the transition of power between Fulgencio Batista and revolutionary leader Fidel Castro in the Cuban Revolution. Piedra was appointed interim president by a junta led by Eulogio Cantillo in accordance with the 1940 Cuban Constitution, but he was not legally recognized by the Supreme Court of Cuba. Piedra was the eldest judge of the Supreme Court. The appointment of Piedra, the last president to be born under Spanish Cuba, was met with opposition from Castro, who believed that Manuel Urrutia should be appointed.[1]
He was married to María Luisa Martínez Díaz and had two daughters, Isis and Flavia Piedra Martínez.