A martyrology is a catalogue or list of martyrs and other saints and beati arranged in the calendar order of their anniversaries or feasts. Local martyrologies record exclusively the custom of a particular Church. Local lists were enriched by names borrowed from neighbouring churches. Consolidation occurred, by the combination of several local martyrologies, with or without borrowings from literary sources.

This is the now accepted meaning in the Latin Church. In the Eastern Orthodox Church, the nearest equivalent to the martyrology is the Synaxarion and the longer Menologion. As regards form, one should distinguish between simple martyrologies that simply enumerate names, and historical martyrologies, which also include stories or biographical details; for the latter, the term passionary is also used.