Ancient Roman fasti were calendars (fasti) that recorded religious observances and officially commemorated events. They were typically displayed in the form of an inscription at a prominent public location such as a major temple; several of these fasti survive, but in states of varying fragmentation. Some calendars are preserved as papyri or manuscripts.

One of the original purposes of Roman calendars was to mark the religious and legal status of each day, by means of letters such as C, F, and NP. By the late 2nd century AD, extant calendars no longer show days marked with these letters, probably in part as a result of calendar reforms undertaken by Marcus Aurelius. A feriale is a listing only of dates for religious or official observances, not a day-by-day accounting of time. The words fasti and feriale are not always distinct in usage, and both fasti and ferialia are listed below.

Extant fasti include those known by the following names: