This study was conducted for two years on the experimental farm of Faculty of Agriculture, University of Eskisehir Osmangazi during 2006-07/2007-08 seasons. The site was under cereal production in the previous season both years. The aim of this study was to determine the optimum sowing time, optimum dose and application time of nitrogen for winter lentil in Eskisehir conditions. The experimental design was split split plot with four replicas. Sowing dates (1(st),15(th) and 30(th) October) were located into the main plots, N doses (0, 20,40 and 60 kg ha(-1)) into subplots and timing of nitrogen application [at sowing, at vegetative stage (3-4 leaves stage), 1/2 part at sowing + 1/2 part at vegetative stage (3-4 leaves stage)] into sub-sub plots. Plant height, first pod height, biological yield per plant, number of pods per plant, number of seeds per plant, grain yield per plant, biological yield, grain yield and harvest index were recorded. Sowing date had a significant effect on yield and yield components. The most suitable period for winter lentil sowing date is between 1(st) and 15(th) of October in the Eskisehir conditions. Increasing nitrogen had insignificant effects on yield and yield components in both years. For this reason, experimental area had sufficient and effective rhizobium bacteria (Rhizobium leguminosarum). Important yield components were higher when N was applied at sowing in the second year but the nitrogen fertilization applied at vegetative stages provided high grain yield in the first year.