Gladu is a surname. Notable people with the surname include:
Camille Gladu (1872–1921) Canadian politician from Ontario Claude Gladu (born 1942), Canadian politician from Quebec Jean-Paul Gladu (1921–2015), Canadian ice hockey player Marilyn Gladu (born 1962), Canadian politician Oscar Gladu (1870–1920), Canadian politician Roland Gladu (1911–1994), Canadian baseball player Victor Gladu (1844–1897), Canadian notary and politician from Quebec