Only one Middle School was ever operated in Wales.
Loreto Middle School was formed in 1970 by the Catholic diocese of Bangor to serve the areas around Llandudno. Serving students aged 9 to 13, it formed part of the diocesan intention to extend catholic schooling provision. It had been hoped to extend the age range to 16. However, this plan never came to fruition, with the school closing in 1985.
At this stage, students in primary years returned to Stella Maris First School, it becoming a primary school.