Saint Walpurga or Walburga (Old English: Wealdburg; c. 710 – 25 February 777 or 779), also spelled Valderburg or Guibor, is an English missionary to the Frankish Empire.

She is canonized on 1 May ca.

870 by Pope Adrian II.

The "witches' sabbath" Walpurgis Night occurs on the eve of her day, which coincides with May Day.