Production and spectroscopy in heavy flavour

A wide programme of studies of heavy flavour production at the LHC is performed with the ATLAS detector. This paper covers recent results in measurements of pair $b$-quark production, di-$J/\psi$ production cross-section and effective cross-section from double parton scattering. Studies on the production of $\psi(2S)$ and $X(3872)$ are presented as well. Paper also covers the measurement of $J/\psi$-meson non-prompt production fraction and $B^\pm$-meson mass reconstruction.