We prepared the melt-spun (Ni 0:6 Nb 0:4 ) 100Àx Zr x (x ¼ 0 to 40 at%) and other amorphous alloy membranes and examined the permeation of hydrogen through those alloy membranes. The interatomic spacing in the Ni-Nb-Zr amorphous structure increased with increasing Zr content. The crystallization temperature of the Ni-Nb-Zr amorphous alloys decreased with increasing Zr content. The hydrogen flow increased with an increase of the temperature or the difference in the square-roots of hydrogen pressures across the membrane, Á ffiffiffi p p . At relatively higher temperature up to 673 K or at relatively higher hydrogen pressure difference, Á ffiffiffi p p up to 550 Pa 1=2 , the hydrogen flow was more strictly proportional to Á ffiffiffi p p . This indicates that the diffusion of hydrogen through the membrane is a rate-controlling factor for hydrogen permeation.The permeability of the Ni-Nb-Zr amorphous alloys was strongly dependent on alloy compositions and increased with increasing Zr content. However, it was difficult to investigate the hydrogen permeability of the (Ni 0:6 Nb 0:4 ) 60 Zr 40 amorphous alloy in this work due to the embrittlement during the measurement. The maximum hydrogen permeability was 1:3 Â 10 À8 (molÁm À1 Ás À1 ÁPa À1=2 ) at 673 K for the (Ni 0:6 Nb 0:4 ) 70 Zr 30 amorphous alloy. It is noticed that the hydrogen permeability of the (Ni 0:6 Nb 0:4 ) 70 Zr 30 amorphous alloy is higher than that of pure Pd metal. These permeation characteristics indicate the possibility of future practical use of the melt-spun amorphous alloys as a hydrogen permeable membrane.