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 Wong-Zakai approximations and attractors for fractional stochastic reaction-diffusion equations on unbounded domains HONGJUN GAO Keywords:Fractional reaction-diffusion equation; Wong-Zakai approximation; random attractor; upper semi-continuity; white noise. Abstract: In this paper, we investigate the Wong-Zakai approximations induced by a stationary process and the long term behavior of the fractional stochastic reaction-diffusion equation driven by a white noise. Precisely, one of the main ingredients in this paper is to establish the existence and uniqueness of tempered pullback attractors for the Wong-Zakai approximations of fractional stochastic reaction-diffusion equations. Thereafter the upper semi-continuity of attractors for the Wong-Zakai approximation of the equation as $\delta\rightarrow0$ is proved.