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In Tunisia lentil (Lens culinaris L.) which is an annual grain legume, is included in cropping systems throughout the semiarid region but information on optimum plant population density was not well developed for this region. This study was conducted in kef (Northwest Semi-Arid region of Tunisia) in order to determine the impact of row spacing and seeding rate on yield and yield components of lentil.‘Siliana’lentil cultivar was sown at 17 and 34cm cm row spacing, and at three seeding rates (80, 120, 160 seeds/m 2). Analysis of variance showed that the effect of row spacing, plant seeding rates and interaction between them was significant on all traits show that was significant on all measured parameters except for 100-seed weight. Results show that 34cm row spacing and seed rate of 120 seeds/m 2 was found to be the best for lentil production in terms of biological and grain yields with 2119, 2 and 903, 9 kg/ha respectively. On the other hand, 17cm row spacing and 160seeds/m 2 affects negatively the yields and components.