abstract:Hunab Ku () is a Yucatec Maya word meaning "The Only God" used in colonial, and more particularly in doctrinal texts, to refer to the Christian God. Since the word is found frequently in the Chilam Balam of Chumayel, regarded by some as indigenous writing not influenced by Christianity, some authors have proposed that the name was originally used for an indigenous Maya deity, which was later transferred to the Christian god but recent research has shown this to be unlikely.