Boulay or du Boulay is a surname, and may refer to:
Antoine Jacques Claude Joseph, comte Boulay de la Meurthe (1761–1840), French politician and magistrate
César-Egasse du Boulay (died 1678), French historian
Clair du Boulay, retired British expert in pathology and medical education
Étienne Boulay (born 1983), Canadian footballer
Francine Boulay-Parizeau (born 1953), former Canadian handball player
Francis Robin Houssemayne Du Boulay (1920–2008), British medieval historian
Henry Du Boulay (1840–1925), Archdeacon of Bodmin, Cornwall (1892–1923)
Herménégilde Boulay (1861–1942), Canadian politician, farmer, manufacturer, merchant and trader
Isabelle Boulay (born 1972), francophone Canadian pop singer
James Houssemayne Du Boulay (1868–1943), British civil servant in India
Joséphine Boulay (1869–1925), French organist and composer
Mathieu Boulay (born 1987), Canadian footballer
Olivier Boulay (born 1957), French automobile designer
Shirley du Boulay, British author and biographer
