Abstract
In this paper, the concept of roughness in KU-algebras is introduced. We study the lower and upper approximations of KU-subalgebras and KU-ideals and proved that the lower/upper approximation of KU-subalgebra (resp., KU-ideals) is a KU-subalgebra (resp., KU-ideals). A connection between rough sets and KU-Algebras with their weak and strong ideals have also been taken under consideration and some related results have been shown.