Seán Dillon (born 30 July 1983) is an Irish professional footballer who plays as a defender for Scottish League One club Montrose, where he is a player-coach. He previously played for Dundee United and Irish teams Longford Town and Shelbourne in the League of Ireland prior to joining Dundee United in January 2007 then Montrose in June 2017. He has represented the Republic of Ireland at under-16, under-21 and B international level.