Single crystals of lead magnesium niobate have been grown by flux crystallization using a modified Czochralski method. The crystals grown are free of pyrochlore impurity and have sizes of (15-28) × (20-30) × 20 mm. The region of congruent melting of solution is determined. The PbO-BO and PbO-BO-KBO systems are chosen to be solvents.