Brett Deacon (born 7 March 1982 in Leicester, England) is an English rugby union coach and former player who notably played for Leicester Tigers in the Premiership.

He is the younger brother of Leicester and England international Louis Deacon.

Deacon played as a replacement when Leicester won the 2007 Premiership final.

[5] On 19 December 2013, Deacon was forced to retire due to a diagnosis of lupus, an autoimmune disease which in his case led to potentially life-threatening blood clots; he was immediately placed on blood thinners.

[6] However, he remained with Leicester Tigers to take a coaching role with their academy.