The Abbey Christian Brothers' Grammar School (Irish: Scoil na Mainistreach, Iúr Cinn Trá[1]) is a voluntary day school for boys aged 11 – 18 years in Newry, County Down, Northern Ireland.

It was named after a Cistercian Abbey founded on the site by St Malachy in 1144.

[3] The school was originally entirely run by the Irish Christian Brothers, but in the late twentieth century their numbers declined and the school is now entirely staffed by lay teachers.

It is now under the trusteeship of the Edmund Rice Schools Trust (NI).

In 2018, 94.5% of its entrants achieved five or more GCSEs at grades A* to C, including the core subjects English and Maths.