Fertilization is a very important factor of production. Fertlizer on oil palm nurseries seed to consider the soil used as a medium. Excessive or insufficient fertilization resulted in inferior growth. The aim of this research was to study the effects of compound fertilizer NPK 11-7-12 on the growth of oil palm seedlings and determine the optimum dose for oil palm nursery seedlings. The research was conducted in a greenhouse at Soil Research Institute, Laladon, Bogor, in October 2012 -June 2013. The design was randomized complete block, 6 treatments and 5 replications. The treatment consisted of 4 (1) NPK 11-7-12, (2) single NPK fertilizer (Urea, SP-36, KCl), (3) NPK 15-15-15, and (4) control treatment (without NPK). Doses of NPK fertilizer was 0.00, 2.50, 5.00, 7.50, and 10.00 g NPK/tree. Beside NPK fertilizer, each polybag was added with Kieserite 1 g/tree. Urea, SP-36, KCl, Kieserite and NPK was given 12 times. Fertilization was performed at 1 week after transplanting, and then performed every 2 weeks up to 12 times. The results showed that NPK fertilizer either single or compound able to increase the growth of oil palm plantations. Effect of NPK 11-7-12 fertilizer was the same with NPK 15- 15-15 and better than the single NPK fertilizer. The optimum dosage of NPK 11-7-12 fertilizer for oil palm seedling is 5 - 6 g/tree.