Dr. Xiao Fang，The Chinese University of Hong Kong

We obtain a general bound for the Wasserstein-2 distance in normal approximation for sums of locally dependent random variables. The proof is based on an asymptotic expansion for expectations of second-order differentiable functions of the sum. Applied to subgraph counts in the Erd\H{o}s-R\'enyi random graph, our result shows that the Wasserstein-1 bound of Barbour, Karo\'nski and Ruci\'nski (1989) holds for the stronger Wasserstein-2 distance.