Pierre Toubert was a French historian. He was a professor of medieval history at the University of Paris and the Collège de France. Focusing on medieval history, his most monumental work is Les structures du Latium médiéval : Le Latium méridional et la Sabine du IXe siècle à la fin du XIIe siècle (1973), in which he outlines an influential, in-depth study of incastellamento (in English, encastellation) in the Lazio region of Italy.