Kieran Paul Sadlier (born 14 September 1994) is a professional footballer who plays as a midfielder for EFL League One club Wycombe Wanderers.

[4] Sadlier previously won both the League of Ireland Premier Division and FAI Cup in his first season with Cork City.

[7] Sadlier made his debut on 28 February in a 1–0 home win against Hamilton Academical coming on as a half-time substitute for Viktor Genev.

Cork City met Dundalk FC in the FAI Cup Final at the Aviva Stadium on 5 November 2017 where Sadlier scored the winning penalty after the game finished 1–1 in extra time.

[31] On 2 April, Bolton won 4–0 against Plymouth Argyle in the 2023 EFL Trophy Final[32] He was out on loan at Leyton Orient at the time, though still received a medal as he had played in the earlier rounds.

[5] For the U15 side, Sadlier made two appearances, scoring on his debut against Northern Ireland U15s and was a substitute against Wales U15s, coming on for the last 20 minutes.

[36][37] He made four appearances for the under-16s against Czech Republic U16s (twice), Portugal U16s and Italy U16s [38][39] and played in three U17 games against Norway U17, Albania U17 and Malta U17s in the U17 Euro Championships.

[40][41][42][43][44] For the U19 team, Sadlier made 10 appearances, starting in all 10 games, scoring one goal against Switzerland U19s in the U19 European Championship finals held in Serbia.