Energy crisis and decreasing fossil fuel resources have necessitated development of alternative and renewable fuels and the research and development in this area is to play an important role in the coming days. Extensive research is carried on generation of bioenergy from renewable sources across the globe. In that domain, there has been a significant research on generating biohydrogen from wastewater. If the structure and growth of research in this promising R&D area is known, it is useful for researchers and policy makers in their future endeavors. The aim of this paper is to carry out a study on the ongoing research on the generation of biohydrogen from wastewater, by analyzing research publications and patents in the area till-date, to grasp the broader global contours of scientific and technological research going on. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.