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O'Halloran has represented Ireland internationally at under-age level. He played for both Ireland schools and the Ireland under-20s. During the 2011–12 season, he was called up by Declan Kidney to train with the senior team. O'Halloran received his first full international cap against South Africa on 18 June 2016.

After graduating from the Connacht academy, O'Halloran was signed on a development contract for the 2011–12 season. That season saw Connacht qualify for the Heineken Cup, Europe's premier club competition, for the first time. On 11 November 2011, O'Halloran scored Connacht's first ever try in the competition against Harlequins in the opening round. He also featured for Connacht in the 36–10 defeat to Toulouse in and the 23–19 loss against Gloucester, scoring another try against Gloucester. O'Halloran then played in the 24–3 loss against Toulouse but played in the province's first ever Heineken Cup win when Connacht beat Harlequins 9–8. In the 2011–12 Pro12 O'Halloran scored tries in both games against the Cardiff Blues along with tries Leinster and Glasgow Warriors. In Round 20 of matches, O'Halloran scored a try in a 26–21 victory over Ulster to take his tally of tries to five in the Pro12 and seven in all competitions.

O'Halloran was involved with the Connacht youth set up from a young age, and trained with the academy squad at just 16 years old. He made his debut against Olympus Madrid in the 2009–10 Challenge Cup, scoring a try 30 minutes into the game. O'Halloran made his league debut in the same season, starting against Scarlets in a 2009–10 Celtic League match on 25 April 2010. The following season, while still in the academy, O'Halloran made three replacement appearances in the 2010–11 Celtic League, but didn't feature in the Challenge Cup.

O'Halloran grew up in Clifden. O'Halloran played rugby with Connemara at a young age. He attended Garbally College in Ballinasloe, playing for the side in the Connacht Junior Schools Cup, scoring a try as they beat Coláiste Iognáid in the final in 2005. O'Halloran later transferred to Cistercian College in Roscrea and played for them in the Leinster Senior Schools Cup.

Tiernan O'Halloran (Irish name: Tiernan Ó hAllaráin; born 26 February 1991) is a professional rugby union player from Ireland. He primarily plays as a fullback or on the wing. O'Halloran currently plays for Irish provincial side Connacht in the Pro14.

He is the son of Aidan O'Halloran, who was a member of the All-Ireland winning Offaly football team in 1982. In 2012, Aidan O'Halloran became President of the Connacht Branch of the IRFU while his son was playing for the senior team.