Alphonsus

Alphonsus may refer to:

as a given name:
 * any of a number of rulers named Alfonso
 * Alphonsus J. Donlon (1867–1923), American Jesuit
 * Alphonsus Liguori (1696–1787), Roman Catholic Saint
 * Alphonsus Liguori Penney (born 1924), Canadian Roman Catholic priest
 * Alphonsus Rodriguez (1532–1617), Spanish Jesuit
 * Alphonsus a Sancta Maria (1396–1456), Spanish historian
 * Alphonsus de Guimaraens (1870—1921), Brazilian poet
 * Alphonsus Cassell (1949–2010), Montserratian calypso and soca musician

as a surname:
 * Petrus Alphonsi (or Petrus Alfonsus) (1062–1110), Spanish Jewish writer

other:
 * Alphonsus (crater) lunar crater