This volume contains the proceedings of the "Workshop on Lightcone QCD and Nonperturbative Hadron Physics", held in Adelaide, Australia, in December 1999. The contributions include papers on vacuum structure and zero models, DLCQ, deep inelastic scattering, lightcone wavefunctions and hadron structure, hadron phenomenology, as well as numerical results from the lattice for both quenched and unquenched QCD.