is an Irish professional football coach and former player who is currently assistant manager of the Republic of Ireland men's national team. He was known for his versatility in playing several defensive and midfield positions on either side of the pitch or the centre. With 14 winners' medals, he is one of the most decorated Irish footballers of all time; only Denis Irwin, Roy Keane, Steve Heighway and Ronnie Whelan have accrued more honours.

Born in County Waterford and growing up in Ferrybank, O'Shea joined Manchester United when he was 17. He spent loan spells at AFC Bournemouth and Royal Antwerp before establishing himself in the Manchester United first team, going on to make 393 appearances and scoring 15 times in all competitions across 12 seasons. He won five Premier League titles, one FA Cup, two Football League Cups, four FA Community Shields, the FIFA Club World Cup and the UEFA Champions League with the club. He joined Sunderland in July 2011. Having played 256 times for the Wearside club and scoring four goals, he signed for Championship side Reading in July 2018. Retiring in May 2019, he joined that club's coaching staff that summer, before leaving in the summer of 2021. He then coached at Stoke City and Birmingham City.

O'Shea made his Republic of Ireland debut in 2001 against Croatia and made 118 appearances for his national team over the next 17 years, scoring three goals, his first in 2003 against Australia. He was part of the team that controversially lost to France in a play-off for the 2010 FIFA World Cup and went on to play in UEFA Euro 2012 and UEFA Euro 2016. He then served as assistant manager on the under-21 and senior teams, as well as interim manager of the latter in 2024.