This volume contains the proceedings of the workshop on Algebraic Varieties and Automorphism Groups which was held at RIMS, Kyoto University from July 7–11, 2014. The volume consists of fifteen original research articles by specialists in fast developing areas ofalgebraic geometry including various aspects of algebraic varieties (singularities, toric surfaces, weak positivity of log canonical pairs, Fano threefolds with cylinders, etc.), algebraic group actions on algebraic varieties (actions of additive group, unipotent group, semi-abelian variety, etc.), automorphism groups of affine varieties and Cremona groups.