2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143976A transitive decomposition of a graph is a partition of the edge set together with a group of automorphisms which transitively permutes the parts. In this paper we determine all transitive decompositions of the Johnson graphs such that the group preserving the partition is arc-transitive and acts primitively on the parts.35 pagesCombinatorics05C25; 20B25text