The unprecedented collision energy reached and the considerable integrated luminosity produced by the LHC allow its experiments to investigate the existence of new physics phenomena beyond the Standard Model of particle physics at the TeV scale. This thesis presents the search performed by the ATLAS Collaboration for evidence of new physics manifesting as localised resonances in the dijet invariant mass distribution of events with large transverse momenta. No evidence of resonant phenomena outside of the Standard Model have been observed in the 20.3 fb^−1 of data collected in 2012 at √s = 8 TeV nor in the 3.6 fb^−1 of data collected in 2015 at √s = 13 TeV. Limits have been set at 95% Credibility Level on the cross-section times acceptance of selected benchmark models. The reach of the dijet analysis at large integrated luminosities and at a collision energy of √s = 14 TeV has been investigated.