Following the international GEOBIA Conferences held in Salzburg, Austria in 2006, Calgary, Canada in 2008, Ghent, Belgium in 2010, and Rio De Janeiro, Brasil in 2012, the 5th GEOBIA Conference of 2014 will be held in Thessaloniki, Greece between 21 and 24 May. The 5th GEOBIA Conference is organized by the Laboratory of Forest Management and Remote Sensing, Aristotle University of Thessaloniki in collaboration with the Balkan Environment Centre, the Laboratory of Remote Sensing and GIS, Aristotle University of Thessaloniki, the Laboratory of Photogrammetry and Remote Sensing, Aristotle University of Thessaloniki and the Laboratory of Forest Aerial Photography Remote Sensing, Democritus University of Thrace. Previous GEOBIA conferences have demonstrated the world-wide interest in the emerging field of Geographic Object-Based Image Analysis. GEOBIA events bring together the technical and scientific community of remote sensing and environmental sciences, promoting the development of GEOBIA concepts, methods and applications. The international audience is expected to include scientists, professionals and users, of academic, industry, public sector and governmental background, coming from the fields of environment and mineral resource management, agriculture, forestry and urban development. Attendees will enjoy the opportunity to communicate new research results, share technical information, network with fellow experts, and build communities of common interests. The conference programme will include keynote speeches by invited renowned experts in GEOBIA, stakeholder round table discussions, oral presentations of selected studies, and poster exhibition. These sessions intend to address advancements, trends and challenges, related to the theory and concepts, methods and algorithms as well as applications, to promote the growth of emerging GEOBIA. Extended illustrated abstracts of the presented studies will be included in conference proceedings and published on the 5th GEOBIA website geobia2014.web.auth.gr. Selected articles will be published in a special issue of Photogrammetric Engineering & Remote Sensing journal, published by the American Society of Photogrammetry and Remote Sensing. Conference live streaming will be available through the GEOBIA 2014 website, and archived videos of the keynotes speeches, opening and closure sessions, will also be available after the end of the event.