Electronic Journal of Differential Equations, Vol. 2009(2009), No. 139, pp. 1-18. Title: Upper semicontinuity of random attractors for non-compact random dynamical systems Author: Bixiang Wang (New Mexico Inst. of Mining and Tech., NM, USA) Abstract: The upper semicontinuity of random attractors for non-compact random dynamical systems is proved when the union of all perturbed random attractors is precompact with probability one. This result is applied to the stochastic Reaction-Diffusion with white noise defined on the entire space R^n. Submitted June 18, 2009. Published October 30, 2009. Math Subject Classifications: 37L55, 60H15, 35B40. Key Words: Stochastic Reaction-Diffusion equation; random attractor; asymptotic compactness; upper semicontinuity.