Rededya, also Ridada or Rededey (Adyghe: Рэдэдэй; died 1022), was a prince of Kassogia, a Circassian tribe from the North Caucasus.

To avoid unnecessary bloodshed, Mstislav and Rededya, who possessed an extraordinary physical strength, decided to have a personal fight, with the condition that the winner would be considered the winner of the battle.

The fight lasted some hours and, eventually, Rededya was knocked to the ground and stabbed with a knife.

In their baptism, Rededya's sons got the names of Yury and Roman.

Some modern Russian historians claimed they may have come to the Caucasus from the Middle East and subsequently assimilated.