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We prove a very general sharp inequality of the H\"older--Young--type forfunctions defined on infinite dimensional Gaussian spaces. We begin byconsidering a family of commutative products for functions which interpolatesbetween the point--wise and Wick products; this family arises naturally in thecontext of stochastic differential equations, through Wong--Zakai--typeapproximation theorems, and plays a key role in some generalizations of theBeckner--type Poincar\'e inequality. We then obtain a crucial integralrepresentation for that family of products which is employed, together with ageneralization of the classic Young inequality due to Lieb, to prove our maintheorem. We stress that our main inequality contains as particular cases theH\"older inequality and Nelson's hyper-contractive estimate, thus providing aunified framework for two fundamental results of the Gaussian analysis.

A sharp interpolation between the H\"older and Gaussian Young inequalities