William of Heytesbury, or William Heytesbury, or William de Heytisbury, called in Latin Guglielmus Hentisberus or Tisberus (c. 1313 – 1372/1373), was an English philosopher and logician, best known as one of the Oxford Calculators of Merton College, Oxford, where he was a fellow.

In his work he applied logical techniques to the problems of divisibility, the continuum, and kinematics.

His magnum opus was the Regulae solvendi sophismata (Rules for Solving Sophisms), written about 1335.

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