Eddie O'Sullivan (born 21 November 1958) is an Irish rugby union coach, player (wing & fly-half) and a former Gaelic footballer.

After attending the Christian Brothers school in the town, he graduated from Thomond College, which a decade later became part of the University of Limerick.

O'Sullivan played for the Garryowen Football Club during the 1970s and 1980s at fly-half and wing, while teaching physical education, maths, and science in Mountbellew, County Galway.

During his time as assistant coach he was credited with advancing Irish back play considerably while working with players such as Brian O'Driscoll, Ronan O'Gara, Peter Stringer, Rob Henderson, Shane Horgan and Denis Hickie.

The fact that the French played later in the day than Ireland gave them an advantage of knowing exactly what score they needed to secure the Championship.

Ireland defeated England in the Six Nations Championship over four consecutive years (2004–2007) including a record victory (43–13) at the iconic Croke Park Stadium in 2007.

Part of the terms of the contract allowed him to leave the position temporarily to coach the 2009 Lions squad, were he to be offered that role.

Ireland turned in poor performances in the opening matches of the World Cup against the lower rated Georgia and Namibia.

Rumours have abounded of conflict in the Irish during the tournament, and even that Geordan Murphy might leave the squad as a result of being dropped from the bench for the French game.

[7] The poor performances continued with the failure of Ireland, for the second time in its history, to qualify for the quarter-final stages of the World Cup, finishing third in its group with two wins and two losses.

After an extensive post Rugby World Cup review it was established that, despite rumours during the tournament, there was no discord among the playing squad.

The failure to perform was identified as an over emphasis on strength and conditioning prior to the tournament along with only 2 pre-tournament warm-up games, leaving the squad short of match preparation.

In the last number of years O'Sullivan has been heavily involved with the men's rugby program at Brown University running their pre-season camp while technically and tactically advising the team throughout the season.