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Creep behavior of the Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu alloy sheet is investigated from 300 • C to 400 • C in the stress range from 50 MPa to 180 MPa along the rolling direction. The measured strain rates range from 8.8 × 10 −10 s −1 to 4.7 × 10 −7 s −1 . The activation energies are estimated to assess the creep deformation mechanisms in this alloy. The strain rate is slightly different at low stress, while it shows a distinct difference at high stresses. Stress exponents of this alloy increase with increasing applied stress at all testing temperatures. It is concluded that the creep deformation of the Zr-1.5Nb-0.4Sn-0.1Fe-0.1Cu alloy is controlled by the diffusion creep at low stress region and by the climbing of dislocations at high stress region.