Liam William Peter Miller (13 February 1981 – 9 February 2018) was an Irish professional footballer. Miller began his career with Celtic and was later loaned to Aarhus in 2001. He returned to Celtic Park and broke into the first-team squad during the 2003–04 season. Rejecting the offer of a new contract from Celtic, he joined Manchester United in 2004 on a free transfer under the Bosman ruling. Loaned to Leeds United during the 2005–06 season, Miller made 22 first-team appearances for Manchester United.
From 2006 until 2009, he played for Sunderland, followed by a short stay at Queens Park Rangers from January until May 2009, when he was released. Miller joined Hibernian in September of that year on a free transfer. He moved to Australia's A-League in 2011 after his contract with Hibernian expired, and represented Perth Glory, Brisbane Roar and Melbourne City there. In 2015, he joined his hometown team Cork City, and a year later Wilmington Hammerheads.