  We find and analyze the Landau-Ginzburg potentials whose critical points
determine chiral rings which are exactly the fusion rings of Sp(N)_{K} WZW
models. The quasi-homogeneous part of the potential associated with Sp(N)_{K}
is the same as the quasi-homogeneous part of that associated with SU(N+1)_{K},
showing that these potentials are different perturbations of the same
Grassmannian potential. Twisted N=2 topological Landau-Ginzburg theories are
derived from these superpotentials. The correlation functions, which are just
the Sp(N)_{K} Verlinde dimensions, are expressed as fusion residues. We note
that the Sp(N)_{K} and Sp(K)_{N} topological Landau-Ginzburg theories are
identical, and that while the SU(N)_{K} and SU(K)_{N} topological
Landau-Ginzburg models are not, they are simply related.
