Mabon is the name used by some Wiccans and other Neopagans for one of the eight solar holidays or sabbats. It is celebrated on the Autumnal Equinox, which in the northern hemisphere occurs on September 23rd (occasionally the 22nd, although many celebrate on the 21st) and in the southern hemisphere is circa March 21.

Also called Harvest Home, the Feast of the Ingathering, or simply Autumn Equinox, this holiday is a ritual of thanksgiving for the fruits of the earth and a recognition of the need to share them to secure the blessings of the Goddess and God during the winter months. The name may derive from Mabon ap Modron, although the connection is unclear.

Among the sabbats, it is the second of the three harvest festivals, preceded by Lammas and followed by Samhain.

A turning point in season of the harvest, the autumn equinox is a time when the day and night are of equal length. Occurring at some point between 20 - 23 September, it is known commonly by the Welsh/Brythonic Alban Elfed, pronounced elved, meaning 'light of autumn'.

The Harvest Home festival was celebrated at the end of the harvest season, on the occasion of the harvest of the last sheaf of grain. (The festival of Lammas was celebrated at the start of the harvest season.) Typically, the last sheaf would be fashioned into a corn dolly, known variously as the cailleac ("old woman" in Gaelic), the Corn-Mother, or the Harvest Queen. In some areas, the sheaf would be fashioned into a Kern-Baby in the case of an early harvest and a Kern-Mother in the case the harvest was late. The cailleac would be paraded through the village and ultimately drenched with water in a ritual intended to ensure good rains in the next season.