Thuillier is a surname. Notable people with the surname include:
Élisabeth and Berthe Thuillier (fl. 1890s–1920s), French mother and daughter duo of colourists Émilie Thuillier, Canadian politician Emilio Thuillier (1868–1940), Spanish actor Harry Thuillier (1925–2011), Irish fencer and broadcaster Henry Edward Landor Thuillier (1813–1906), British surveyor in India Henry Fleetwood Thuillier (1868–1953), British Army officer Henry Shakespear Thuillier (1895–1982), British Army officer Henry Ravenshaw Thuillier (1838–1922), British surveyor in India Jacques Thuillier (1928–2011), French art historian Jean Thuillier (1921–2017), French novelist Leslie de Malapert Thuillier (1905–1999), British Army officer Louis Thuillier (1856–1883), French biologist Luc Thuillier (born 1964), French actor Nick Thuillier (1907–1983), Irish fencer Pierre Thuillier (1799–1858), French painter Thierry Thuillier (born 1963), French television journalist