The synthesis of yttrium aluminum garnet (YAG) (Y 3 Al 5 O 12 ) nanopowder was carried out by sol-gel method. Y(NO 3 ) 3 .6H 2 O, Al(NO 3 ) 3 .9H 2 O in the presence of citric acid as complexing agent were used as starting materials. YAG nanopowder was characterised by FTIR, TGA, and XRD. To get phase-pure nanocrystalline YAG powder at relatively lower temperature, calcination at various temperatures was studied and calcination temperature was optimised. Particle size, estimated by XRD using Scherrer's equation, was found to be 2835 nm which was further confirmed by transmission electron microscopy. The particle morphology was studied by SEM.