|Date of birth||26 December 1979|
|Place of birth||Neath, Wales|
|Briton Ferry Llansawel|
|2001||→ Luton Town (loan)||13||(1)|
|2004–2005||→ Chester City (loan)||8||(0)|
|2015–||Briton Ferry Llansawel|
|* Senior club appearances and goals counted for the domestic league only and correct as of 11:00, 4 May 2010 (UTC).
A Welsh under-21 international, Hillier began his professional career at Tottenham Hotspur before joining Luton Town on loan in August 2001. He made his professional debut in a 2–1 win over Cheltenham Town on 18 August and went on to make a total of 13 appearances in all competitions, scoring one goal in a 2–1 win over York City. Towards the end of 2001, he made his move to Luton permanent with a two-year deal for a fee of £30,000. A regular in his first two seasons, Hillier gradually fell out of favour with new manager Mike Newell and, after making 42 league appearances and having a spell on loan at Chester City, left to join Newport County in the summer of 2005 following trial spells at Oxford United, Bristol Rovers and Grimsby Town. Hillier made his debut for the Wales semi-professional international team in May 2007.
At the end of his first season at Newport, Hillier was voted both players and supporters player of the year and was later awarded the captaincy at the start of the 2008–09 season. In September 2008 Hillier broke his leg in three places in an accident while working in his day job as a tree surgeon when a falling branch struck his leg, breaking his tibia, fibula and ankle. He was subsequently sacked by Newport County as he was unable to fulfil his contract and would be out of the game for a large part of the 2008–09 season. Hillier appealed the against the cancellation of his contract and won an initial case against the club. Newport themselves decided to appeal against the case but prior to the hearing a surprising turnaround saw the club offer Hillier a new contract, which he accepted. However, he never played for Newport again and signed for Neath in April 2009.
- "York 1–2 Luton". BBC Sport. 15 September 2001. Retrieved 13 October 2009.
- "Kinnear to strengthen". BBC Sport. 28 October 2001. Retrieved 13 October 2009.
- "Chester snap up Luton duo on loan". BBC Sport. 16 December 2004. Retrieved 13 October 2009.
- "Ian Hillier". lutonfc.com. Retrieved 13 October 2009.
- "Luton trio impress Pirates's boss". BBC Sport. 19 April 2005. Retrieved 13 October 2009.
- "Midfielder given Mariners trial". BBC Sport. 27 July 2005. Retrieved 13 October 2009.
- "Football player's leg crushed in accident". WalesOnline. 5 September 2008. Retrieved 13 October 2009.
- "Hillier sacked". South Wales Argus. 25 September 2008. Retrieved 12 January 2009.
- "Hillier to come home". South Wales Argus. 17 December 2008. Retrieved 12 January 2009.
- "Hillier to spearhead Neaths new era". welsh-premier.com. 30 April 2009. Retrieved 13 October 2009.
- "Three more Eagles find a new nest". Welsh Premier League. Retrieved 15 June 2012.