{{Infobox School | name = C.B.S High School Clonmel |native_name = Ardscoil na mBráithre |logo = | image = | imagesize = 120px | established = 1899 | type = Secondary school |principal = Ms. Steenson | [[ city = Clonmel |county = Tipperary | province = Munster |country = Ireland |denomination = Roman Catholic
|schooltype = Congregation of Christian Brothers|colours =
}}
CBS High School Clonmel (Ardscoil na mBráithre), is a second level Christian Brothers school in Clonmel, County Tipperary in Ireland. It was built in 1899 and its first Superior was Joseph White. A new school building was first occupied in 1971. By 1985, it had a student population of 550 and 31 staff. There are now over 40 staff and 800 students.
The school currently competes in the Dr. Harty Cup in hurling and the Corn Uí Mhuirí in Gaelic Football. In 2017, they were the All-Ireland B Post Primary School Gaelic football champions, one of the proudest achievements in the schools sporting history. The school produced many All-Ireland Minor Football Championship winners for Tipperary GAA in 2011 including 2016 all star Michael Quinlivan.
The school is traditionally successful at schools soccer, but that success has waned in recent years most likely due to the success of Gaelic football in the school.
As a public school the High School would not be traditionally successful at rugby, but in the last decade or so they are closing that gap. One of the rugby highlights for the school was winning the U-15 Cleary cup final in 2015.