We present calculations of the leading and O(1/N) terms in a large-N
expansion of the \beta-functions for various supersymmetric theories: a
Wess-Zumino model, supersymmetric QED and a non-abelian supersymmetric gauge
theory. In all cases N is the number of a class of the chiral superfields in
the theory.Comment: 9 pages, tex, five figures. Uses harvmac and epsf. Revised to include
a discussion of higher loop DRED ambiguities. Some references added, and
notation clarifie