Allantide (, meaning first day of winter, or Nos Kalan Gwav, meaning eve of the first day of winter and Dy' Halan Gwav, meaning day of the first day of winter) is a Cornish festival that was traditionally celebrated on the night of 31st October, as well as the following day time, and known elsewhere as Hallowe'en. The festival itself seems to have pre-Christian origins similar to most celebrations on this date, however in Cornwall it was popularly linked to St Allen or Arlan a little-known Cornish Saint. Allantide is also known as Allan Night and Allan Day, possibly in reference to the Cornish. The origins of the name Allantide probably stem from the same sources as Hollantide (Wales and the Isle of Man) and Hallowe'en itself.

Allantide (, meaning first day of winter, or Nos Kalan Gwav, meaning eve of the first day of winter and Dy' Halan Gwav, meaning day of the first day of winter) is a Cornish festival that was traditionally celebrated on the night of 31st October, as well as the following day time, and known elsewhere as Hallowe'en. The festival itself seems to have pre-Christian origins similar to most celebrations on this date, however in Cornwall it was popularly linked to St Allen or Arlan a little-known Cornish Saint. Allantide is also known as Allan Night and Allan Day, possibly in reference to the Cornish. The origins of the name Allantide probably stem from the same sources as Hollantide (Wales and the Isle of Man) and Hallowe'en itself.