|Full name||Errington Ridley Liddell Keen|
|Date of birth||4 October 1910|
|Place of birth||Walker, Newcastle upon Tyne, England|
|Date of death||July 1984 (aged 73)|
|Place of death||Fulham, England|
|Playing position||Left half|
|* Senior club appearances and goals counted for the domestic league only|
Errington Ridley Liddell Keen (4 October 1910 – July 1984) was an English football player and manager. Keen played at both professional and international levels, before becoming a coach at both national and international level in Europe and Africa.
Born in Walker, Newcastle upon Tyne, Keen, who played as a left half, played club football for Newcastle Schools, Nun's Moor, Newcastle Swifts, Newcastle United, Derby County, Chelmsford City, Hereford United, Leeds United and Bacup Borough.
Keen died in July 1984.
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- "Manager History". Hereford United F.C. official website. Archived from the original on 29 September 2009. Retrieved 27 November 2009.
- "Memories of Eric". Herefordshire News. Retrieved 15 November 2010.
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- "Egypt Squad List - 1948 Summer Olympics". FIFA. Archived from the original on 19 June 2008. Retrieved 27 November 2009.
- 李峻嶸 (29 June 2015). 足球王國：戰後初期的香港足球. 三聯書店(香港)有限公司. pp. 169–. ISBN 978-962-04-3782-3.
- "England's Players - Kail to Konchesky". England Football Online. Retrieved 27 November 2009.
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