President for One Day may refer to:
- David Rice Atchison, a 19th-century U.S. Senator best known for the claim that he served as Acting President of the United States on March 4, 1849
- Clímaco Calderón, who served as President of Colombia on December 21, 1882
- Pedro Lascuráin, who served as President of Mexico for less than one hour on February 19, 1913