2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/68792We compute Aut(W) for any even Coxeter group whose Coxeter diagram is connected, contains no edges labeled 2, and cannot be separated into more than 2 connected components by removing a single vertex. The description is given explicitly in terms of the given presentation for the Coxeter group and admits an easy characterization of those groups W for which Out(W) is finite.16 pages, no figures. Submitted to Trans. Amer. Math. SocGroup Theory20F55 (primary), 20F28 (secondary)text