Until the discovery that Maya stelae depicted kings instead of high priests, the Maya priesthood and their preoccupations had been a main scholarly concern. In the course of the 1960s and over the following decades, however, dynastic research came to dominate interest in the subject. A concept of royal ʼshamanismʼ, chiefly propounded by Linda Schele and Freidel, came to occupy the forefront instead. Yet, Classic Maya civilization, being highly ritualistic, would have been unthinkable without a developed priesthood.^{[citation needed]} Like other Pre-Hispanic Mesoamerican priesthoods, the early Maya priesthood consisted of a hierarchy of professional priests serving as intermediaries between the population and the deities. Their basic skill was the art of reading and writing. The priesthood as a whole was the keeper of knowledge concerning the deities and their cult, including calendrics, astrology, divination, and prophecy. In addition, they were experts in historiography and genealogy. Priests were usually male and could marry. Most of our knowledge concerns Yucatán in the Late Postclassic, with additional data stemming from the contemporaneous Guatemalan Highlands.

The Maya class of the priests is sometimes thought to have emerged from a pre-existing network of shamans as social complexity grew. The classic Siberian shaman is characterised by his intimate relationship with one or several helper spirits, 'ecstatic' voyages into non-human realms, and often operates individually, on behalf of his clients. In 20th-century Maya communities, diviners, and also curers, may show some features of true shamans, particularly vocation through illness or dreams, trance, and communication with a spirit. In reference to these features, they are often loosely called 'shamans' by ethnographers. On the other hand, priests are chiefly cultic functionaries operating within a well-defined hierarchy and offering food, sacrifices and prayers to the deities on behalf of social groups situated on different levels. In 20th-century Maya communities of the north-western Guatemalan highlands, the hierarchies of 'Prayermakers' offer examples of such priests. The Pre-Hispanic religious functionaries described by men like Diego de Landa, Tomás de Torquemada and Bartolomé de las Casas were also priests, not shamans.

Among the Mayas, priestly functions were often fulfilled by dignitaries who were not professional priests, but this fact cannot be used to argue the nonexistence of a separate priesthood. The Popol Vuh stereotypically describes the first ancestors as "bloodletters and sacrificers" and as the carriers of their deities, a priestly function. To the Kʼicheʼ kings and highest dignitaries coming after them, the kingship was a sacred institution and the temple service a duty: during certain intervals, they abstained from intercourse, fasted, prayed, and burnt offerings, "pleading for the light and the life of their vassals and servants." Although the text describes the three temples dedicated to the first ancestors' patron deities and names what appear to be the two high priests of the main deities (the Lords Ah Tohil and Ah Cucumatz), it does not discuss, or even mention, local priests.

According to some Yucatec sources, too, the rulers and the high nobility carried out priestly tasks. The highest Mayapan nobility, for example, is stated to have served continually in the temples; for the early Choles, no regular priesthood is mentioned, so that one might assume that the chiefs performed the priestly functions themselves. The Yucatec king (or "head chief of a province"), known as the halach uinic ('true man'), is defined both as a 'governor' and a 'bishop'. Without a grounding in esoteric and ritual knowledge, a ruler could apparently not function.

For the Classic period, the king should probably be considered a sacred, priestly king, perhaps subsuming in his person the priesthood as a whole. The latter idea has been used as an explanation for the seeming lack of references to priests in Classic period texts. The idea of the king representing the priesthood should not be pushed to its limits, however, since due to our lack of knowledge of priestly titles and imperfect understanding of the script, textual references to priests may easily pass unnoticed. The existence of a separate Classic priesthood, at the kingdom's court as well as in its towns and villages, is hardly doubtful; its absence would constitute an anomaly among early civilizations.

The main description of a priestly hierarchy as it functioned in the first decades of the 16th century stems from Landa's account of Yucatec society, but isolated terms for priestly offices have also been transmitted from other Maya groups.

In Yucatán, priests were sons of priests or second sons of nobles. The priesthood provided high status positions for those children of the Maya nobility who could not obtain political office. They were trained through an apprentice system, with young adults being selected according to their descent and individual abilities.

The high priest of the kingdom ('province') was called ahau can mai or ah kin mai, with mai being either a family name or a functional designation. The position was hereditary, usually passed on to sons or close relatives. The high priest lived from the contributions of his town priests and the gifts of the lords. The responsibilities of the ahau can mai included the writing of books; the teaching of the Maya script and the Maya calendar to the novices; examining and appointing new priests and providing them with books; performing the more important rituals; and advising the other lords.