Thomas Vavasour (born about 1536–7 – died at Kingston upon Hull, 2 May 1585) was an English Roman Catholic physician, and pensioner of St John's College, Cambridge.
He subsequently went to Venice, where he took the degree of M.D., and on 20 November 1556, he received a licence from the College of Physicians of London to practise for two years.
Edmund Grindal describes him as "sophistical, disdainful, and illuding arguments with irrision, when he was not able to solute the same by learning", and adds that "his great anchor-hold was in urging the literal sense of hoc est corpus meum, thereby to prove transubstantiation".
Later on, he was in the Gatehouse, Westminster, from which he was released on submitting to acknowledge the royal supremacy in religious matters; but he was again imprisoned as a recusant in Hull Castle, York where he died.
His wife, Dorothy, died in the New Counter, Ousebridge, York, 26 October 1587.