Sean Hillier is an English semi-professional football defender who is unattached. Hillier began his career at Brentford and made one professional appearance before dropping into non-league football upon his release in 2005. He played the majority of his career with North Greenford United and made over 250 appearances across five spells with the club. He is currently assistant coach of Brentford Women.
Hillier signed on loan for Conference South club Welling United on 3 September 2004, as cover at right back for Tony Browne. He made one appearance and returned to Brentford on 27 September.
Hillier joined Combined Counties League Premier Division club North Greenford United on loan in February 2005, until the end of the 2004–05 season. He made 11 appearances and scored two goals during his spell.
AFC Wimbledon
Hillier signed for Isthmian League Premier Division club AFC Wimbledon on 30 July 2005. He made his only first team appearance for the club as a 51st-minute substitute for Michael Woolner in a 2–0 defeat to Bromley on 25 October 2005 and departed at the end of the 2005–06 season.
Return to North Greenford United (loan)
Hillier rejoined Combined Counties League Premier Division club North Greenford United on loan in November 2005, until the end of the 2005–06 season. He made 28 appearances during his spell and scored a seasonal-best five goals.
Hillier signed for Southern League First Division South & West club Hanwell Town during the 2006 off-season. He left the club in early 2007.
Third spell with North Greenford United
Hillier rejoined North Greenford United for the third time in early 2007 and made his first appearance in a 3–0 win over Raynes Park Vale on 3 February. He helped the Blues to the 2007 Premier Challenge Cup Final versus Merstham, but suffered a 4–1 defeat. He made 21 appearances and scored one goal during the 2006–07 season. He departed the Blues in February 2008, having made 46 appearances and scored three goals during his year with the club.
Hillier signed for Combined Counties League Premier Division club Chertsey Town on 27 February 2008 and made eight appearances during the remainder of the 2007–08 season, before departing the club.
Fourth and fifth spells with North Greenford United
Hillier signed for North Greenford United for the fourth time during the 2008 off-season and was a virtual ever-present during the 2008–09 season, making 42 appearances and helping the Blues to a second-place finish in the Combined Counties League Premier Division. Hillier won the first competitive silverware of his career during the 2009–10 season, with the Combined Counties League Premier Division title and the Middlesex Senior Charity Cup. The cup win set up a match versus Middlesex Senior Cup winners Staines Town for the George Ruffell Memorial Shield in August 2010, but though Hillier got on the scoresheet, the Blues were denied more silverware after suffering a shootout defeat. Playing Southern LeagueFirst Division Central football for the 2010–11 season, Hillier made 52 appearances and scored one goal in a season of consolidation. Hillier played through until the end of the 2012–13 season, which was his last with the club until his return in 2017. In the interim, he played for Middlesex County League Premier Division club New Hanford and spent time recovering from a tendon injury.
