  Although the existence of dark matter is well established by many
astronomical measurements, its nature still remains one of the unsolved puzzles
of particles physics. The unprecedented energy reached by the Large Hadron
Collider (LHC) at CERN has allowed exploration of previously unaccessible
kinematic regimes in the search for new phenomena. An overview of most recent
searches for dark matter with the ATLAS detector at LHC is presented and the
interpretation of the results in terms of effective field theory and simplified
models is discussed. The exclusion limits set by the ATLAS searches are
compared to the constraints from direct dark matter detection experiments.
