XEP may refer to:XEP (software), an XML to PDF converter Isthmian script XMPP Extension Protocol, in the XMPP Standards Foundation Chi Epsilon Pi, a US honor society XEP-AM, a radio station in Mexico Épernay - Plivot Airport, in the List of airports by IATA code Athis Airfield, a former airport Swiss Cosmetic Activen Brand, a cosmetic active from a Swiss based company.