  We determine the fine-tuning of the Yukawa couplings of supersymmetric QCD,
discretized on a lattice. We use perturbation theory at one-loop level. The
Modified Minimal Subtraction scheme ($\overline{{\rm MS}}$) is employed; by its
definition, this scheme requires perturbative calculations, in the continuum
and/or on the lattice. On the lattice, we utilize the Wilson formulation for
gluon, quark and gluino fields; for squark fields we use na\"ive
discretization. The sheer difficulties of this study lie in the fact that
different components of squark fields mix among themselves at the quantum level
and the action's symmetries, such as parity and charge conjugation, allow an
additional Yukawa coupling. Consequently, for an appropriate fine-tuning of the
Yukawa terms, these mixings must be taken into account in the renormalization
conditions. All Green's functions and renormalization factors are analytic
expressions depending on the number of colors, $N_c$, the number of flavors,
$N_f$, and the gauge parameter, $\alpha$, which are left unspecified. Knowledge
of these renormalization factors is necessary in order to relate numerical
results, coming from nonperturbative studies, to the renormalized, ``physical"
Green's functions of the theory.
