In this talk we present various measurements sensitive to non-perturbative physics performed using data collected by the ATLAS experiment at the LHC. Inclusive single diffractive dissociation (pp->pX) is studied using data collected by the ATLAS experiment at the LHC. The intact proton is reconstructed and measured in the ALFA forward spectrometer, while charged particles from the dissociative system (X) are reconstructed and measured using the ATLAS central detector. If available, an additional measurement of the properties of the dissociative system is presented for events with a proton reconstructed in the AFP detector. Finally, if available, this talk will also present the underlying event measurements using strange particles as probes.