LONG-DISTANCE CONTRIBUTION TO K-]PI+NU(NU-OVER-BAR()

We estimate the long distance contribution to the K+ --> pi+ vvBAR dec ay amplitude using chiral perturbation theory. We find that it is like ly to be less than a few percent of the part of the short distance con tribution proportional to the square of the charm quark mass. In the l arge N(c) limit the leading (in chiral perturbation theory) long dista nce contribution to K+ --> pi+ vvBAR from Feynman diagrams with a W an d Z0 vanishes.