ATLAS B-physics potential

Studies since 1993 have demonstrated the ability of ATLAS to pursue a wide B physics program. This document presents the latest performance studies wi th special stress on lepton identification. B-decays containing several lep tons in ATLAS statistically dominate the high-precision measurements. We pr esent new results on physics simulations of CP violation measurements in th e B-S(0) -> J/psi phi decay and on a novel ATLAS programme on beauty produc tion in central proton-proton collisions of LHC.