Seamus Vincent McCartan (born 18 May 1994) is a Northern Irish footballer who plays as a forward for NIFL Premiership side Portadown.

[5] He was part of the squad that got to the FA Youth Cup semi-finals for the first time since 1978, scoring a last minute goal against West Bromwich Albion in the process.

[6] McCartan was first involved with the first-team squad in September 2011, when he was an unused substitute in the 2–1 League Cup victory over Milton Keynes Dons.

[8] McCartan made his professional debut three days later in a 2–1 win over Doncaster Rovers, coming on as a substitute for Josh McQuoid in the final minute.

[9] Manager Eddie Howe had played a number of youth team graduates towards the end of the 2011–12 season in an attempt to fill out the "Clarets" squad.

[22] Accrington qualified for the play-offs at the end of the 2015–16 season, missing out on automatic promotion after finishing behind third-placed Bristol Rovers on goal difference.

They were eliminated from the play-off semi-finals with a 3–2 aggregate defeat to AFC Wimbledon; McCartan was substituted at the end of normal time in the second leg, which Accrington had been winning 2–1 on the night before conceding an equalising goal in extra-time.

[30] He struggled to settle in at Valley Parade and Head of Recruitment Greg Abbott revealed that nine clubs had expressed an interest in McCartan in the January transfer window.

[28] He ended the 2017–18 season with four goals in 28 games, and Lincolnshire Live journalist Mark Whiley reported that: "McCartan showed glimpses of quality but found himself in and out of the team as the Bantams went through two permanent managers, Stuart McCall and Simon Grayson, and one caretaker boss, Greg Abbott".

[16][33] This was despite him winning the League Two Goal of the Month award for January for an "exquisitely struck volley" with "ferocity and outright power" in a 2–2 at Swindon Town.

[36] McCartan was initially reluctant to return to the club but soon found that the "poisonous changing room" atmosphere had been transformed by Bowyer into "a positive place to be at".

[41] McCartan made his debut for the Northern Ireland U17 side in October 2010, in the 2011 UEFA European Under-17 Championship qualifying round, a 0–0 draw with Montenegro.

[49] He scored his first goal for the under-21s in their 2–1 defeat to Ukraine on 17 November 2015; the game was part of Northern Ireland's 2017 UEFA European Under-21 Championship qualification campaign.

[53] Manager Michael O'Neill handed him a second cap on 3 June 2018, in a 3–0 friendly defeat to Costa Rica at San José's Estadio Nacional.

[26] Also a Gaelic footballer, he won a MacRory Cup winners medal with St Colman's College, Newry in March 2010, coming on as a substitute in the final at Casement Park.