Effects of low level Tb doping on the critical current properties of Dy123 melt-solidified bulks were systematically studied. The Tb-doped bulks showed high Jc characteristics compared to the undoped bulks. The microstructural observation, X-ray diffraction and local compositional analyses revealed that fine BaTbO 3 precipitates were dispersed in the Dy123 matrix. In the a-growth region, Jc in low fields was largely improved to be ∼10 5 A/cm 2, suggesting that those particles acted as effective pinning centers. A sample cut from just below the seed in the c-growth region of the Tb-doped bulk showed enhanced second peak effect in Jc- H curves. This is probably due to the local fluctuation of RE composition induced by Tb doping.