In this paper we evaluate the social rentability of maize agricultural research conducted at the Institute of Agricultural Science and Technology (ICTA), from 1973-90. We used an econometric model ofthe national maize market in Guatemala. As social benefits we take into account the increases in the surpluses ofproducers and the savings obtained by notimporting maize. In the evaluation we obtained a B/C relationship of 6.06 and a TIR of 96.95%, which indicate that maize agronomic research has proved to be a highly profitable activity for this society.