A field experiment was conducted during the winter seasons of 2012–13 and 2013–14 at Varanasi (U.P.) to evaluate the effect of fertility levels and weed management on lentil and associated weeds. Cyperus rotundus, Chenopodium album, Solanum nigrum and Cynodon dactylon were the major weeds found in association with lentil. Application of 75% RDF + Plantgro 9 kg/ha (foliar spray at 35, 50 and 65 DAS) recorded minimum density and dry matter accumulation of weeds and recorded higher yield attributes, yield (1.28 t/ha) and nutrient uptake by the crop followed by 100% RDF + 2% urea spray at pre-flowering and pod initiation. Among herbicides, application of imazethapyr 37.5 g/ha minimized the density and dry matter accumulation by weeds, and significantly increased yield attributes, yield and nutrient uptake by crop.