Electronic Journal of Differential Equations, Vol. 2013 (2013), No. 42, pp. 1-12. Title: Controllability of semilinear matrix Lyapunov systems Authors: Bhaskar Dubey (Indian Inst. of Space Science, Thiruvananthapuram, India) Raju K. George (Indian Inst. of Space Science, Thiruvananthapuram, India) Abstract: In this article, we establish some sufficient conditions for the complete controllability of semilinear matrix Lyapunov systems involving Lipschitzian and non-Lipschitzian nonlinearities. In case of non-Lipschitzian nonlinearities, we assume that nonlinearities are of monotone type. Submitted September 24, 2012. Published February 06, 2013. Math Subject Classifications: 49K15, 93C15, 93C10, 93B05, 47H05. Key Words: Controllability; matrix Lyapunov systems; monotone nonlinearities; Lipschitzian nonlinearities.