Cosmological and astrophysical observations point to the existence of an exotic type of matter known as Dark Matter (DM) that accounts for about 84% of the mass of the Universe. If DM is realized in the form of weakly interacting massive particles (WIMPs) it could be produced at the LHC 𝑝 𝑝 collider. At colliders, mono-X final states are considered golden channels, for which DM particles are produced in association with energetic jets of hadrons, photons, W/Z bosons or top-quarks. Here we present the latest results from the ATLAS collaboration on the mono-jet and the mono-photon searches in 𝑝 𝑝 collisions at 13 TeV using an integrated luminosity of up to 139 fb−1. The results are translated into exclusion limits in different models for new physics including DM simplified models, supersymmetry inspired models, models with large extra spatial dimensions, and models for the production of axion-like particles.