Electronic Journal of Differential Equations, Vol. 2024 (2024), No. 77, pp. 1-15. Title: Ulam type stability for nonlinear Hahn difference equations with delay Authors: Kai Chen (Guizhou Univ., Guiyang, Guizhou, China Jinrong Wang (Guizhou Univ., Guiyang, Guizhou, China) Abstract: In this article, we study the Ulam type stability of nonlinear Hahn difference equations with delay over a finite interval. First, we use the Banach fixed point theorem to prove the existence and uniqueness of a solution. Then we establish the Ulam stability for first and second order nonlinear Hahn difference equations with delay. We also extend our analysis to $n$-th order nonlinear Hahn difference equations with delay. To illustrate our theoretical findings, we provide three examples. Submitted September 9, 2024. Published November 30, 2024. Math Subject Classifications: 39A05, 39A30. Key Words: Nonlinear Hahn difference equation; delay; Ulam-Hyers stability; Ulam-Hyers-Rassias stability.