Seaforde’s Bethany Firth will compete for Great Britain after switching allegiance from Ireland.
The 17-year-old Co Down girl, who is a Paralympic gold medal-winning swimmer, had her request approved by the International Paralympic Committee.
Firth won the won the 100m backstroke at the London Games last year.
Paralympics Ireland said: “We would like to express our gratitude to her for all that she has achieved in her time competing with Team Ireland”.
Firth followed up her Paralympic gold by winning three silver medals at the IPC World Championships in Montreal in August.