XEP may refer to: XEP (software), an XML to PDF converter Isthmian script (ISO 639-3 code) 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 (IATA code), in the List of airports by IATA code Athis Airfield (IATA code), a former airport Swiss Cosmetic Activen Brand, a cosmetic active from a Swiss based company.