Ortlieb of Strasbourg (also spelled Ordevus, Orclenus, Ortlevus and Ortlibus) was a theologian in the early 13th century who lived in Strasbourg. He was the founder of a pantheistic movement, whose followers called themselves the Ortlibarii (or Ortliebers, Ortliebiens, Ortliebians, Ortlibenses, Ortibenses, Ordibarii).