Callistus, Calistus, Callixtus, and Calixtus (all four in Latin) and Kallistos (  "the most beautiful one") may refer to:

Patriarchs, popes and antipopes

  • Patriarch Callistus I of Constantinople, patriarch from 1350 to 1353 and from 1354 to 1363
  • Patriarch Callistus II of Constantinople, patriarch in 1397
  • Saint Callixtus I, pope from c. 217 to 222
  • Pope Callixtus II, pope from 1119 to 1124
  • Antipope Callixtus III, antipope from 1168 to 1178
  • Pope Callixtus III, pope from 1455 to 1458

Other persons

  • Callistus, a Roman general of the 3rd century more commonly known as Balista
  • Callistus Caravario (1903–1930), Italian Roman Catholic priest and missionary
  • Callistus Chukwu (born 1990), Nigerian footballer
  • Callistus Ndlovu (1936–2019), Zimbabwean politician
  • Callistus Valentine Onaga (born 1958), Nigerian Roman Catholic bishop
  • Callistus Rubaramira (born 1950), Ugandan Roman Catholic bishop
  • Gaius Julius Callistus, a Greek freedman of the Roman emperor Caligula
  • Georg Calixtus (1586–1656), German Lutheran theologian
  • Kallistos Ware (1934–2022), Metropolitan of Diokleia in Phrygia, an Orthodox assistant bishop in the UK
  • Nikephoros Kallistos Xanthopoulos, last of the Greek ecclesiastical historians, flourished c. 1320

See also

  • Calixte, French-language variant