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The research study was carried out from July to December 2019 at the Bangladesh Agricultural University’s (BAU) Farm Management Section in Mymensingh with the goal of determining how nitrogen management and nursery seeding density affected the yield of transplant Aman rice cultivars. Factor A: Rice variety (2)-BRRI dhan49 (V1), BRRI dhan71 (V2) and Factor B: Nitrogen management (3)-Control nitrogen (No nitrogen) (N0), 100% Recommended dose of nitrogen (100% recommended dose N: 165 kg ha-1) (N1) and 75% of Recommended dose of Nitrogen+2.5 t poultry manure ha-1 (N2) and Factor C: Seeding density in the nursery (3)- 40 g seeds m-2 (S1), 60 g seeds m-2 (S2) and 80 g seeds m-2 (S3). Results showed that BRRI dhan71 transplanted with 75% recommended dose of nitrogen ha-1+2.5 tone poultry manure ha-1 and 60 g seeds m-2 produced tallest plant (132.80 cm) and BRRI dhan49 transplanted with 100% recommended dose of nitrogen ha-1 and 40 g seeds m-2 produced the shortest plant (101.13 cm). Interaction of BRRI dhan71 transplanted with 100% recommended dose of N and 60 g seeds m-2 provided the highest number of total tillers hill-1 (13.89), effective tiller hill-1 (13.12), 1000-grain weight (23.73 g), grain yield (5.81 t ha-1), straw yield (6.46 ha-1) and biological yield (12.28 t ha-1) and interaction of BRRI dhan71 transplanted with no nitrogen and 40 g seeds m-2 provided the lowest numbers of total tillers hill-1 (8.38), effective tiller hill-1 (7.38), 1000-grain weight (19.56 g), grain yield (3.05 t ha-1), straw yield (4.23 ha-1) and biological yield (7.28 t ha-1). So, it can be concluded that the variety BRRI dhan71 and 100% recommended dose of nitrogen ha-1 with 60 g seeds m-2 may be used to obtain the highest grain yield of transplant aman rice.