Recent Heavy Flavour Results from ATLAS

We present here a selection of B-physics results from the ATLAS experiment taking data at the Large Hadron Collider (LHC). The ATLAS analyses allowed good quality of B-physics measurements, reproducing essential B-hadron properties and demonstrating a good performance of the detector. We include in this report the measurement of the centrality dependence of $J/psi$ yields in lead-lead collisions, observations of $chi_{cJ}$ and $chi_b$ states with a first observation of a $chi_b(3P)$ state, the search for the rare decay $B^0_s o mu^+mu^-$ and, finally, a measurement of $B_s o J/psi phi$ decay parameters.