The present invention is concerned with novel indol-2-yl-carbonyl-piperidin-benzoimidazolon and indol-2-yl-carbonyl-piperidin-benzoxazolon derivatives as V1a receptor antagonists, their manufacture, pharmaceutical compositions containing them and their use for the treatment of anxiety and depressive disorders and other diseases. In particular, the present invention concerns compounds of formula (I) wherein R1 to R11, X and Y are as defined in the specification.