HAŠK Mladost
Since its founding in 1954, HARK Mladost has been a member of the Croatian Academic Sports Society Mladost of the University of Zagreb and bears its name.
HAŠK Mladost, ZRS and HRS
Since its founding HARK Mladost has been part of university sport at the University of Zagreb, and it competes as a member of the Zagreb and national rugby federations.
Zagreb Rugby Federation
HARK Mladost is a member of the Zagreb Rugby Federation.
Croatian Rugby Federation
As a member of the Croatian Rugby Federation, Mladost competes in the Croatian Championship and the Croatian Cup in all age groups.