Calculations for the excitation functions of 63Cu(n,p)63Ni, 63Cu(n,np)62Ni, 63Cu(n,)60Co, 63Cu(n,)60mCo, 63Cu(n,n)59Co, 63Cu(n,n')63Cu, and 63Cu(n,2n)62Cu reactions were carried out using Hauser-Feshbach and preequilibrium reaction theories for neutrons in the 1- to 20-MeV energy range. The results have been compared with reported measurements and standard evaluations.