Easy access to hydro-climatic data is a necessary precondition for the progress and success of any water resources research project. Without (easy) access to these data, realistic and reliable assessment of a catchment under study is impossible. The aim of this note is not to discuss the importance of the collection of hydro-climatic data but to emphasise the worthiness of easy access to such data. Briefly alluding to authors' personal experiences of data access issues, a few suggestions are made in order to develop a comprehensive online database of Iran's hydro-climatic data and water resources information easily accessible to the water research community, i.e. both national and international researchers.