All students must wear a school uniform as its purpose is to ensure equality and to have uniformity of dress amongst the school body.

The uniform consists of: School jacket, College jumper, grey shirt, red tie, grey trousers/black skirt, black shoes or leather deck shoes, black socks/tights. Students must wear the correct items of uniform at all times to participate in school. No other items of clothing are accepted as appropriate for school. Clothing including all forms of outer coats, scarves etc. must be left in lockers and are not permitted to be worn in school. Please note that Coláiste Fionnchua expects students to follow guidelines on appropriate personal presentation for school, including hair, jewellery and make-up. Full information may be found in the Coláiste Fionnchua Code of Behaviour. Students are expected to present themselves appropriately to participate in school.