Mendo Páez de Sorrez or Mendo Páez de Sorred or Men Páez Sorred or Mem Páez Sorred (b. c. 1070 or 1180 - d. c. 1230) was a Spanish noble in the service of the Kingdom of Galicia and by default, also the Kingdom of Castile. He was the head of the and is best known for founding the by initiating the population of the Valle de Soto.