ATLAS results on exotic hadronic resonances

Recent results from the proton-proton collision data taken by the ATLAS experiment on exotic resonances are presented. A search for $J\mathrm{/}\psi p$ resonances in ${\mathrm{\Lambda }}_b\to J\mathrm{/}\psi pK$ decays with large $pK$ invariant masses is reported. A search for exotic resonances in the four-muon final state is shown.