Ryan O'Neill may refer to:
Ryan O'Neill, born April 26, 1978 in Lima, Pennsylvania is an American former professional soccer midfielder.
Ryan O'Neill (born 19 January 1990) is a footballer from Northern Ireland who plays as a defender for Glentoran.
He began his career in the youth team at West Ham United and has represented Northern Ireland at under-21 level, and is a cousin of Barnet team-mate Mark Hughes. He signed for Barnet in August 2009 and made his debut in a 1-0 away defeat to Lincoln City on 8 August 2009. O'Neill was released at the end of the season.
Ryan signed for Northern Irish Premiership and home town side Dungannon Swifts in September 2010, making his debut against Donegal Celtic.
In July 2013, O'Neill signed a 2-year contract with Irish Cup winners Glentoran and was allocated the Number 2 shirt, previously worn by Club record appearance holder Colin Nixon