Title: Behavior Regularized Offline Reinforcement Learning. Abstract: In reinforcement learning (RL) research, it is common to assume access to direct online interactions with the environment. However in many real-world applications, access to the environment is limited to a fixed offline dataset of logged experience. In such settings, standard RL algorithms have been shown to diverge or otherwise yield poor performance.  Accordingly, much recent work has suggested a number of remedies to these issues.  In this work, we introduce a general framework, behavior regularized actor critic (BRAC), to empirically evaluate recently proposed methods  as well as a number of simple baselines across a variety of offline continuous control tasks. Surprisingly, we find that many of the technical complexities introduced in recent methods are unnecessary to achieve strong performance. Additional ablations provide insights into which design choices matter most in the offline RL setting.