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In this talk, I first motivate the use of Chiral Perturbation Theory in thecontext of Lattice QCD. In particular, I explain how partially quenched QCD,which has, in general, unequal valence- and sea-quark masses, can be used toobtain real-world (i.e. unquenched) results for low-energy constants. In thesecond part, I review how Chiral Perturbation Theory may be used to overcometheoretical difficulties which afflict the computation of non-leptonic kaondecay rates from Lattice QCD. I argue that it should be possible to determineat least the O(p^2) weak low-energy constants reliably from numericalcomputations of the K to pi and K to vacuum matrix elements of thecorresponding weak operators.Comment: 13 pages, invited plenary talk at Chiral 2000, Jefferson Lab., July  17-22, 200

CHIRAL PERTURBATION THEORY, NON-LEPTONIC KAON DECAYS, AND THE LATTICE