These proceedings are presenting an overview of the diboson and multiboson production cross-section results obtained by the ATLAS collaboration using proton-proton collisions at the LHC at CERN. The note is focused on the latest measurements of $ZZ$, $W^±Z$, $W^+W^-$ production at $\sqrt{s}$=13 TeV, of $W^+W^-$ and $W^±Z$ production in the semileptonic final state at 8 TeV and of triboson production at 8 TeV. Constraints on anomalous triple and quartic gauge boson couplings obtained from these measurements are briefly discussed as well. At present the measured cross sections are found to be in agreement with the Standard Model predictions within the estimated uncertainties.