Lentil is an important annual legume crop in the semi-arid regions of Pakistan. The current two years study was conducted to determine the impact of row spacing on the growth and yield parameters of lentil varieties. Three lentil genotypes (M-85, NIA Masoor 2005 and NIA Masoor 2016) were evaluated at three spacing treatments (15, 30 and 45 cm) under the RCBD. The morphological characteristics of lentil genotypes depicted that maximum germination, plant height, number of branches plant-1, number of pods plant-1, weight of 1000 seeds, seed yield, and early days to maturity were observed at 30 cm row spacing. Interaction of varieties x row spacing indicated that NIA Masoor 2016 showed the best performance at 30 cm row spacing. This genotype exhibited highest germination (97.02 %), plant height (41.17 cm), number branches per plant (7.53), number of pods per plant (54.93), number of seeds per plant (2.75), 1000 seed weight (60.09 g), and seed yield (1863.6 kg ha-1) at 30 cm row spacing. The results of the current study can be used for optimal lentil production for enhancing lentil yield in Pakistan.