Olivia Breen (born 26 July 1996) is a Welsh Paralympian athlete, who competes for Wales and Great Britain mainly in T38 sprint and F38 long jump events.

Breen switched from sprints to compete in the long jump for Wales at the Commonwealth Games finishing narrowly out of the medals in seventh place.

The teenager then went on to compete at the IPC European Championships where she won individual bronze in the 100m behind teammate Sophie Hahn and Russia's Margarita Goncharova just a few months after recording a new personal best over the distance – 13.47.

Breen then ran the second leg of the T35-38 relay team, which included Bethany Woodward, Sophie Hahn and Jenny McLoughlin.

[15] Breen won a silver medal in the long jump at the World Para Athletics Championships in Paris as well as finishing sixth in the 100 metres.

[16][17] In June, Breen was among the first 10 members of the Great Britain athletics team selected for the 2024 Summer Paralympics where she will compete in the long jump[18][19] and the 100m.