Title New Geometries for Finite Groups Authors C. Lefèvre-Percsy, N. Percsy and D. Leemans Reference Bull. Belg. Math. Soc. - Simon Stevin, 7(2000), nr. 4, 583-610. Math. Reviews 2001m:51020 Zentralblatt 0974.51011 Abstract We describe two methods to obtain new geometries from classes of geometries whose diagram satisfy given conditions. This gives rise to lots of new geometries for finite groups, and in particular for sporadic groups. It also produces new thin geometries related to polytopes.