Carlos Castillo Armas was a Guatemalan military officer and politician who was the 28th president of Guatemala, serving from 1954 to 1957 after taking power in a coup d'état. A member of the right-wing National Liberation Movement (MLN) party, his authoritarian government was closely allied with the United States.

The president of Guatemala, officially titled President of the Republic of Guatemala, is the head of state and head of government of Guatemala, elected to a single four-year term. The position of President was created in 1839.