Soft QCD Measurements in ATLAS

Measurements dominated by soft QCD processes, made with the ATLAS detector using LHC $pp$ data at $sqrt{s}=0.9, 2.36$ and $7$ TeV, are presented. It is crucial that these processes are understood at LHC energies in order to be able to control the non-perturbative aspects of the Standard Model and allow the exploitation of the LHC data to its fullest extent. The inclusive, diffractive-enhanced and diffractive-suppressed charged particle multiplicity are compared to current models, together with track-based measurements of the underlying event.