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¹ A. Ü.Ziraat Fakültesi Tarla Bitkileri Bölümü, Ankara - This research was carried out in 1998 at the experimental fields of the Department of Field Crops, Faculty of Agriculture of the University of Ankara. The aim of this research was to determine the effect of nitrogen doses on plant height, number of axillary branch on main stem, number of pods on main stem, pod length, number of seeds per pod, 1000 seed weight, oil ratio, protein ratio and seed yield of some winter rape seed cultivars. In the study, Licord, Liberator and Capitol winter rape seed cultivars and 4 different nitrogen doses (0, 8, 12, 16 kg/da) were used. According to the results of this research; the highest plant height (140.93 cm) was determined with N₁₂ nitrogen dose in cv. Capitol and the lowest plant height (115.93 cm) was found with No (control) in cv Liberator. In terms of oil ratio, the highest value (51.17 %) was obtained from cv. Capitol with N₈ nitrogen dose. Oil ratio decreased by increasing of nitrogen doses, the highest protein ratio (36.65 %) was determined with Nl6 nitrogen dose in cv. Licord. The seed yields increased by increasing of nitrogen doses too. The highest seed yield (290.49 kg/da) was obtained from cv. Liberator with N₁₂ nitrogen dose and the lowest seed yield was found with N₀ (control) in cv. Licord. Keywords : Rape; nitrogen dose; plant theight; oil ratio; protein ratio;seed yield