An experiment was conducted at the research field of the Department of Agronomy and Haor Agriculture, Sylhet Agricultural University, Sylhet-3100 during Kharif 2 Season to find out the effect of plant spacing on the yield of mungbean varieties. The experiment was conducted considering two factors, mungbean varieties viz., BARI mung-6 (V₁) and Patuakhali local (V₂),plant spacing’s viz., S₁= (30cm × 15cm),S₂= (30cm × 10cm), S₃= (30cm × 5cm). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The results showed significant variation in important yield parameters like podsplant^-1, seeds pod^-1 and seed yield. The interaction effect indicated that BARI mung-6 with moderate and closer spacing had the highest number of pods plant^-1 (9.27 and 9.00, respectively); on the other hand the highest seeds pod^-1 (12.27) was produced in Patuakhali local variety with closer spacing. The variety BARI mung-6 produced the highest seed yield of 825.32 kg ha^-1 with closer plant spacing which was statistically similar in Patuakhali local variety in highest and moderate spacing but the lowest seed yield (606.1 kg ha^-1) was produced in Patuakhali local variety with closer spacing. Therefore, BARI mung-6 with closer spacing (30cm × 5cm) can be recommended to cultivate mungbean during Kharif 2 season in Sylhet region.