A native of Waterford, O'Connor joined local club Waterpark and represented the team in the 2018–19 Munster Junior League season whilst a sixth-year student.
[1] Ahead of the 2019–20 season, O'Connor joined Limerick All-Ireland League club Young Munster.
[1] Following the disruption caused by the province's recent tour to South Africa, O'Connor made his senior competitive debut for Munster in their opening 2021–22 Champions Cup fixture away to English club Wasps on 12 December 2021, starting in the province's 35–14 win.
[3] O'Connor made his league debut for Munster as a replacement for Jean Kleyn in the province's 29–24 away defeat against South African side the Bulls in a rescheduled round 6 fixture during the 2021–22 United Rugby Championship on 12 March 2022.
[6] After being released by Munster, O'Connor moved to England to join Premiership Rugby club Exeter Chiefs.