Kieran Marmion (born 11 February 1992) is an Irish rugby union player who primarily plays as a scrum-half.

Marmion came into Connacht's academy through the Irish Exiles program and plays his club rugby with Galway Corinthians.

Marmion was born in Barking, England to an Irish father and English mother and was raised in Brecon, Wales.

[4] Marmion came to Connacht from the IRFU Exiles system, which helps Irish-qualified players overseas to make their way into professional rugby in Ireland.

[5] Marmion made his debut for Ireland Under-20 on 10 June 2011, starting against England Under-20 in their opening 33–25 defeat of the 2011 IRB Junior World Championship.

He also started for Ireland U20 in their historic 19–23 win against South Africa Under-20 on 4 June 2012, in the opening game of the 2012 IRB Junior World Championship.