The management of water resources for human purposes is a central theme to the challenge of improving food security worldwide. The great majority of freshwater is used for agriculture; therefore, it is important to find a way to assess and quantify water consumption for the production of agricultural goods. The indicator of unit Water Footprint (uWF) identifies the volume of water required to produce a unit of product. This indicator may refer separately to green and blue water, which are respectively the rainwater component (green water footprint) and the irrigation contribution (blue water footprint). In this study, the spatial and temporal variability of green and blue water footprint of maize is investigated, exploring its evolution in the years 1970 – 2019 across the world, with the creation of high-resolution global maps (5 x 5 arc min resolution), and highlighting the spatial heterogeneities of this variable as dependent on crop yield and climatic conditions.