A field experiment was conducted during September to November, 1992 at the Regional Agricultural Reseach Station (RARS), Ishurdi, Bangladesh, to evaluate the growth performance of a mungbean line (cv. Mosk-1) under varying plant population densities. The treatments consisted of 20 x 10*, 30 x 10*, 40 x 10*, 50 x 10*, 60 x 10* and 70 x 10* plants ha1. The lowest plant population density recorded the highest total dry matter (TDM) plant1, crop growth rate (CGR), and pods plant1, while higher plant population (i.e. 50 or 60 plants m2) produced the highest grain yield (> 1.30 t ha1) and higher TDM per unit area. TDM, leaf and pod dry matter were positively correlated with grain yield. In contrast, stem and petiole dry matter showed negative correlation with grain yield.