Robert de Say, also called Robert Fitz-Picot, was a Norman knight who arrived in Shropshire after the Norman invasion.
Robert is most noted for the initial construction of Clun Castle, building it overlooking the lands he had seized from Edric the Wild after the invasion. The family name de Say comes from the Norman village of Sai, in Orne. Robert was an important vassal of Roger of Montgomery, the 1st Earl of Shrewsbury and a major early Norman magnate. Robert died in 1098.
Robert's son Henry de Say continued possession of Clun Castle. Robert's daughter married the Welsh lord Cadwgan ap Bleddyn, who acquired permission to move to England, probably Clun, in 1109.