|Full name||Mark Christopher Blackhall|
|Date of birth||17 November 1960|
|Place of birth||Upney, Essex, England|
|* Senior club appearances and goals counted for the domestic league only
Blackhall was a product of Orient's youth system, and made his first team debut in a 3–0 victory over Leicester City on 18 May 1982. He featured occasionally during the following season, and scored his only goal in a 5–2 defeat at Brentford on 22 January 1983.
- "The Men who Made Leyton Orient", N Kaufman & A Ravenhill, Tempus, 2002 pp. 46-47