The Medallion Shield is an annual rugby union competition involving schools affiliated to the Ulster Branch of the Irish Rugby Football Union. The competition is open to all schools within Ulster, but only schools from within Northern Ireland currently enter, with no entries from schools situated in the three Ulster counties within the Republic of Ireland. Campbell College, Belfast, has won 32 outright, most recently being the 2022 season. The 2020 season consisted of a final between favourites Campbell College and Royal Belfast Academical Institution with Campbell College winning 20–15.