The Munster Schools Junior Cup or Munster Junior Cup is the under-age rugby union competition for schools affiliated to the Munster Branch of the IRFU with team members under 16 years of age.
The competition has been traditionally dominated by Cork city's major rugby playing schools P.B.C. claiming the most titles (32)and C.B.C. with 19 titles. The County Tipperary school Rockwell College has won 20 titles, with the remaining titles (23 in all), won by mostly Limerick schools with the exception of one West Cork school, Bandon Grammar School. The Limerick wins are largely due to contributions from Crescent College and St. Munchin's with seven victories respectively.