This book constitutes the thoroughly refereedproceedings of the 4th International Conference on Smart Cities and Green ICTSystems, SMARTGREENS 2015, and the 1st InternationalConference on Vehicle Technology and Intelligent Transport Systems, VEHITS2015, held in Lisbon, Portugal, in May 2015.The 15 full papers of SMARTGREENS 2015 presentedwere carefully reviewed and selected from 73 submissions. VEHITS 2015 received27 paper submissions from which 3 papers were selected and published in thisbook. The papers reflect topics such as smart cities, energy-aware systems andtechnologies, sustainable computing and communications, sustainabletransportation and smart mobility.