Adam Kieran O'Reilly (born 11 May 2001) is an Irish professional footballer who plays as a midfielder for Derry City in the League of Ireland Premier Division.

He made his professional debut for Preston North End in December 2018, aged 17 before spending time on loan at Hyde United, Stalybridge Celtic (over two spells), Bamber Bridge, Waterford and St Patrick's Athletic.

During his time with the club he produced an act of sportsmanship that went viral, passing a penalty straight to the opposing goalkeeper after it was deemed that it was unfairly awarded to his side.

[7] The highlight of the season came in February 2018 when he was named on the substitute's bench for the first team's Championship match against Wolverhampton Wanderers, although he was not called to enter the field of play.

[11] At the start of March 2019, O'Reilly signed for Hyde United on a short-term loan deal and made his debut for the club in a 2–1 defeat to Farsley Celtic.

[26] On 20 January 2022, O'Reilly signed for League of Ireland Premier Division runners up and FAI Cup holders St Patrick's Athletic on loan until 31 July, ahead of their 2022 season.

[32] O'Reilly made his first appearance in European football on 21 July 2022 in a 1–1 draw with Slovenian side NŠ Mura in the UEFA Europa Conference League.

[37] On 30 January 2023, O'Reilly departed Preston North End after six and a half years at the club, signing for League of Ireland Premier Division side Derry City on a two-year-contract for an undisclosed fee.