Heavy flavour physics results from the ATLAS experiment

ATLAS has a wide programme to study the production cross-section and decay properties of particles with beauty, as well as charmonium and bottomonium states. This paper covers the latest ATLAS results, including searches for excited b-hadrons, new decay modes of $b$-hadrons, indirect New Physics searches in rare $B$-hadron decays, as well as the study of mixing and CP violation in the $B_s$ system. We also review the results in the domain of charmonium production, including $J\psi$, $\psi(2s)$ and $\chi_c$ states, associated vector boson +$J/\psi$ production and search for hidden-beauty state $X_b$, the bottomonium counterpart of $X(3872)$, in the $\Upsilon \pi \pi$ channel.