Coordinates: 55°50′53″N 4°25′01″W / 55.848°N 4.417°W
St Mirin's Academy was a Roman Catholic senior secondary school for boys founded in 1922 in Paisley, Scotland and dedicated to St Mirin, the patron saint of the town and of the Diocese of Paisley. The original buildings were in East Buchanan Street next to St Mirin's Church.
In 1933 the school relocated to new buildings in Renfrew Road. St Mirin's Academy ceased to exist in 1976 when it amalgamated with St Margaret's Senior Secondary (a girls' school) to become St Mirin's and St Margaret's High School.
The Academy's Latin motto was Fortis et Fidelis ("Brave and Faithful"). There has been no school in the town of Paisley named for St Mirin since 2001. Neil MacKinnon, the school's longest serving rector (1948–1975), died on 7 May 2009, aged 99.
On 24 April 2010, the former St Mirin's Academy building, then part of the Reid Kerr College complex, was badly damaged by fire. Estimates of damages ran between £250,000 and £500,000. The building was demolished in October 2010.