Dara James Morgan Costelloe (born 11 December 2002) is an Irish footballer who plays as a forward for Northampton Town on loan from Burnley.

[3] In February 2021, it was announced that Costelloe had signed a contract for Premier League side Burnley having trained and featured for the under-18 and under-23 setups since the previous summer.

[5] He finished as top scorer for the under-23 side with twelve goals and also made the bench for the first team for the last seven games of the Premier League season as Burnley were relegated.

[5] Costelloe made his first team debut on 29 July 2022, starting the first league game of the season in a 1–0 win over Huddersfield Town at the Kirklees Stadium.

[16] Costelloe made his Republic of Ireland U21 debut on 16 June 2023, in a 2–2 draw with Ukraine U21 in a friendly played in Bad Blumau, Austria.