|Full name||Diarmuid O'Carroll|
|Date of birth||16 March 1987|
|Place of birth||Killarney, Ireland|
|Height||1.80 m (5 ft 11 in)|
|2007||→ Ross County (loan)||15||(2)|
|2006||Republic of Ireland U21||1||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 00:52, 10 March 2012.
† Appearances (Goals).
O'Carroll started his youth career with Home Farm before joing Celtic's Youth Academy, he had featured for Celtic's reserve side for several years, but did not play for the first team. In 2007 he had a loan spell with Ross County F.C. and, in July 2008, it was announced that O'Carroll had signed a one-year deal with English League Two Morecambe.
In the summer of 2009 O'Carroll had many trials, including one at Újpest FC, but he did not agree a deal with the Hungarian club. He played for Shamrock Rovers in their win over Hibernian F.C. in July but was not offered a contract  One month later he signed a one-year deal with Airdrie United. Due to financial cutbacks at the club, he left in May 2010. O'Carroll then went on trial at Raith Rovers. He scored his first goal for Raith as a trialist away to Forfar Athletic in a pre-season friendly on 13 July 2010. On 30 July he signed for Icelandic side Valur.
In November 2010, after returning from Iceland O'Carroll signed a pre-contract agreement with Glenavon in Northern Ireland. He became eligible to play from January 2011. In an Irn-Bru league cup match on 20 September 2011, O'Carroll scored a double-hatrick Until this time, he played for amateur side Dollingstown to maintain his match fitness.
On 7 May 2014, O'Carroll was confirmed to have left Cliftonville and joined Crusaders, signing a two-year pre-contract for the club.
O'Carroll has been capped at every youth level and under 21 for Ireland, but has never played for the Republic of Ireland at full international level.
O'Carroll started his charity work by running a half-marathon in aid of Suicide Awareness in June 2010 in Belfast and continued that in October of that year by running the Dublin City Marathon for the same cause.
O Carroll has completed a number of coaching badges and has a long term ambition of pursuing this area after he retires from playing.
- IFA Premiership (2): 2012–13, 2013–14
- Irish League Cup (2): 2012–13, 2013–14
- Irish Cup (1): 2012–13 (runner-up)
- "O'Carroll stepping back to go forward". Irish Independent. 27 December 2009. Retrieved 12 September 2011.
- "Glenavon sign former Airdrie striker Diarmuid O'Carroll". BBC Sport. 24 November 2010. Retrieved 12 September 2011.
- "O'Carroll makes point with strike". celticfc.net.
- "Morecambe snap up Celtic striker". BBC Sport. 1 July 2008. Retrieved 1 July 2008.
- "Striker O'Carroll joins Diamonds". BBC Sport. 22 September 2009. Retrieved 22 September 2009.