Nigeria’s Education Policy is quite laudable yet her investments in education are not too rewarding considering the deteriorating educational standards. No matter how laudable education policies/programmes are, poor implementation would lead to poor quality education which in effect undermines capacity building and sustainable development. This study therefore investigated the major administrative constraints affecting curriculum development and implementation in Nigeria and remedies. A survey was conducted using 2,706 randomly sampled secondary school administrators in Nigeria. Three research questions and one hypothesis were formulated. Results of data analyses using statistical mean and t-test revealed no significant difference among administrators’ perceptions, identifying eight major administrative constraints of plannerexecutor (4.12) manpower (4.08), acceptance (4.04), planning process (3.88), teacher demand/supply (3.78), environment (3.49), sociological (3.36) and manual method of operation (3.02). Also, most effective remedies were to relate educational policies/programmes to specific educational issues and school administrators should participate fully in all stages of policy/programme formulation/planning which were consequently recommended.