Ipil-ipil {Leucaena leucocephala (Lam.) de Wit} is considered as an outstanding tree because of its worldwide success as a highly nutritious forage tree. Thisstudy is an attempt to determine suitable spacing for maximum biomass production. Widerspacing (60 cm x 60 cm) provided maximum seedling growth (height 177.9 cm and collar dia. 15.3 mm) and biomass production (green weight 276.0 g/seedlingand dry weight 166.5 g/seedling) at the age of nine months of the seedlings. However, closer spacing (15 cm x 15 cm) produced significantly higher biomass(green weight 28.21 ton/ha and dry weight 11.68 ton/ha) on an area basis. Small land holding farmers may rear their livestock by planting this legume and harvesting under a ‘cut-and-carry’ system which will supply high quality forage that uses to supplement low quality roughage such as crop residues.