First time in Australia, the International Conference on 2D Materials and Technologies is a great opportunity for Australian and international scientists to discuss latest progress in two-dimensional materials research and their applications. This 4th meeting reflects the rapidly growing field of 2D materials, covering graphene, transition metal dichalcogenides, black phosphorus, topological insulators, perovskites, MX3 and other new forms of 2D materials. We also look forward to hearing recent developments of 2D materials in electronics, photonics, optoelectronics, catalysis, bio-medical, environmental and energy applications.