Con O'Neill (gebore 15 Augustus 1966) is 'n Engelse akteur. Hy is bekend vir sy rolle in die rolprent The Lord of the Rings: The Return of the King (2003) en in die televisiereeks The Tunnel (2013).
- 1990: Dancin' Thru the Dark
- 1998: Bedrooms and Hallways
- 1999: The Last Seduction II
- 2003: The Lord of the Rings: The Return of the King
- 2005: What's Your Name 41?
- 2008: Telstar: The Joe Meek Story
- 2011: Bash Street
- 2012: Frank
- 2013: Riot
- 1994: Moving Story
- 1998: Real Women
- 1999: Real Women II
- 2008: Criminal Justice
- 2012: Uncle
- 2013: The Tunnel
- 2015: Ordinary Lies
- 1990: The Lilac Bus
- 2004: Wipe Out
- 2009: Margot