The Dubliner finished first in the pool this afternoon.
Ellen Keane has won gold for Ireland at the Paralympics.
The Dubliner took first in the final of the SB8 100 metres breaststroke in a time of 1 minute 19-point-9-3 seconds.
It's Ireland's first medal of the games and a new personal best time for Keane.
The 26-year-old - who was a bronze medal winner in Rio four years ago - held off the challenge of New Zealand's Sophie Pascoe.
Limerick's Roisin Ni Riain also set a new personal best in the S13 100 metres backstroke final.
The 16-year-old finished in sixth place in a time of 1 minute 8-point-6-1 seconds.
The USA's Gia Pergolini took gold and set a new world record of 1 minute 4-point-6-4 seconds.
In Equestrian, Rosemary Gaffney and Werona failed to progress in the Grade 4 individual test after a 15th place finish.
Earlier, 2016 gold medal winning cyclists Katie-George Dunlevy and Eve McCrystal finished sixth in the B1000 metres time trial.
Ronan Grimes was 15th in the C4-5 100 metres time trial.
Colin Judge received a walkover in his scheduled Class 3 table tennis singles match and is back in action tomorrow.