The Mittelschüler-Kartell-Verband der katholischen farbentragenden Studentenkorporationen Österreichs or simply Mittelschüler-Kartellverband (MKV) (English: MKV Middle School Cartel Association) is an Austrian umbrella organisation of Catholic male student fraternities (Studentenverbindung).

In contrast to umbrella organizations like, for example, the Cartellverband der katholischen deutschen Studentenverbindungen, the fraternities of the MKV do not consist of students from universities but from the upper levels of Austrian grammar schools.

As the MKV was founded upon the federalistic principle, these fraternities are organized in nine provincial sub-organizations according to the official Austrian federal provinces.

The MKV itself is a member of the Europäischer Kartellverband (EKV), a European umbrella organization.

The MKV has friendly relations with other umbrella organizations that are members of the Europäischer Kartellverband (EKV), especially with the Cartellverband der katholisch österreichischen Studentenverbindungen (ÖCV).