Alcalus mariae, common name Mary's frog or Palawan eastern frog, is a species of frog in the family Ceratobatrachidae. It is endemic to the Palawan Island, the Philippines, and only known from its type locality, Mount Balabag, in the Mantalingajan mountain range. The specific name refers to Mary Lee Inger née Ballew, first wife of Robert F. Inger who formally described the species in 1954.