2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154559The present paper is devoted to the investigation of properties of Cartan subalgebras and regular elements in Leibniz $n$-algebras. The relationship between Cartan subalgebras and regular elements of given Leibniz $n$-algebra and Cartan subalgebras and regular elements of the corresponding factor $n$-Lie algebra is established.20 pages, submitted to Communications in AlgebraRings and AlgebrasRepresentation Theory17A32, 17A42, 17A60text