Abstract. In this paper, we study the approximate controllability of nonlinear impulsive stochastic di¤erential equations in a real separable Hilbert space. We prove the approximate controllability of nonlinear impulsive stochastic control systems under the assumption that the corresponding linear system is approximately controllable. By using the stochastic analysis theory and a fixed point strategy, su‰cient conditions are formulated and proved. Moreover, an example is also provided to illustrate the e¤ectiveness of the result.