  Let X = G/P be a cominuscule rational homogeneous variety. (Equivalently, X
admits the structure of a compact Hermitian symmetric space.) I give a uniform
description (that is, independent of type) of the irreducible components of the
singular locus of a Schubert variety Y in X in terms of representation
theoretic data. The result is based on a recent characterization of the
Schubert varieties by an non-negative integer A and a marked Dynkin diagram.
Corollaries include: (1) the variety is smooth if and only if A=0; (2) if G of
Type ADE, then the singular locus occurs in codimension at least three.
