  We present parton-level analytical results for the next-to-leading order
non-singlet virtual and real corrections to the Drell-Yan differential
cross-section. The dependence of the differential cross section on the helicity
of the initial state partons is shown explicitly (the spins of the final state
partons are summed). The calculation is implemented in dimensional
regularization within the $\bar{MS}$ scheme and with the t'Hooft Veltman
prescriptions for the n-dimensional $\gamma_5$. Both the polarized initial
state and the unpolarized cross sections can be obtained from our result. Our
unpolarized cross section agrees with the previous result of Ellis, Martinelli
and Petronzio in the non-singlet sector.
