Catholicon (building), the primary church in an Orthodox or Eastern Catholic monastery

Catholicon (Mor Yakub), part of the Holy Liturgy of Mor Yakub of the Syriac Orthodox Church

Catholicon (electuary), an alleged all-purpose cure used in pre-modern medicine

Catholicon is also another word for Panacea.

Catholicon (religious dictionary), written in 1286 by Johannes Januensis de Balbis (Summa grammaticalis quae vocatur Catholicon)