Bayes may refer to:
- Thomas Bayes (1702–1761), British mathematician, statistician and religious leader
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- Bayesian probability
- Bayes' theorem, a result in probability theory
- Bayes estimator, a statistical estimator that minimizes the average risk
- Gilbert Bayes (1872–1953), British sculptor
- Nora Bayes (1880–1928), American singer and actress