The Germanic calendars were the regional calendars used amongst the early Germanic peoples, prior to the adoption of the Julian calendar in the Early Middle Ages.

The Germanic peoples had their own names for the months which varied by region and dialect, which were later replaced with local adaptations of the Roman month names. Our records of Old English and Old High German month names date to the 8th and 9th centuries, respectively. Old Norse month names are attested from the 13th century. Like most pre-modern calendars, the reckoning used in early Germanic culture was likely lunisolar. The Runic calendar developed in medieval Sweden is lunisolar, fixing the beginning of the year at the first full moon after winter solstice.

The month names do not coincide, thus it is not possible to postulate names of a Common Germanic stage, except possibly the name of a spring and a winter month, *austr- and *jehul-. The names of the seasons are also Common Germanic, *sumaraz, *harbistoz, *wentrus, and perhaps *wēr- "spring". The Common Germanic terms for day, month and year were *dagaz, *mēnō-þ- (moon) and *jǣrom. The latter two continue Proto-Indo-European *me(n)ses-, *iero- while *dagaz is a Germanic innovation from a root meaning "to be hot, to burn".