|Full name||Oliver Cahill|
|Date of birth||29 September 1975|
|Place of birth||Clonmel, Tipperary, Republic of Ireland|
|Playing position||Left Winger|
|* Senior club appearances and goals counted for the domestic league only.
Cahill had a youth career with Clonmel Celtic. He then moved to English outfit Northampton Town. He later returned to Ireland for spells with Cork City, Shelbourne, Drogheda United, Shamrock Rovers, Sporting Fingal and Bohemians.
Cahill began his career with Clonmel Celtic, one of Ireland's top junior football clubs winning an FAI Junior Cup winners medal with them in 1994. He then spent two seasons at Northampton before returning home in the summer of 1996. Despite playing a friendly for Waterford United against Southampton he signed for Cork City. After six seasons at Cork he moved to Shelbourne in the summer of 2002. While he was with Shelbourne he won the League of Ireland championship in 2003, 2004 and 2006. Cahill was signed by Drogheda United on 23 December 2006. With Drogheda, Cahill won his fourth Premier Division title in five seasons and a Setanta Sports Cup winners medal in 2007.
Cahill signed for Shamrock Rovers on 16 January 2009 along with Stephen Bradley in what was Michael O'Neill's first signings. He departed Shamrock Rovers in July 2010 after making 53 appearances for the club. and soon signed for Sporting Fingal.
Cahill jointly holds the record with Owen Heary for most appearances in European competition for an Irish domestic player (41). He scored for Shelbourne against Olimpija Ljubljana in August 2003  and again for Drogheda United against Levadia Tallinn on 16 July 2008 in a UEFA Champions League qualifier .
Cahill retired from the game at the end of the 2011 season.
- League of Ireland: 5
- FAI Cup: 1
- Cork City – 1998
- Setanta Sports Cup: 1
- FAI Junior Cup: 1
- Clonmel Town - 1994
- "Ollie Cahill hangs up his boots". RTÉ Sport. RTÉ. 24 January 2012. Retrieved 24 January 2012.