2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/100880A (normal) variety is Gorenstein if it is Cohen-Macualay and its canonical sheaf is a line bundle. This property, which measures the ``pathology'' of the singularities of a variety, is thus stronger than Cohen-Macualayness, but is also weaker than smoothness. We determine which Schubert varieties are Gorenstein in terms of a combinatorial characterization using generalized pattern avoidance conditions. We also give an explicit description as a line bundle of the canonical sheaf of a Gorenstein Schubert variety.15 pages, geometric characterization of Gorensteinness added; final version to appear in Adv. MathAlgebraic GeometryCombinatorics14M15; 14M05; 05E99text