Sir Malcolm Roy Jack KCB (born 1946) was the Clerk of the House of Commons of the United Kingdom from 2006 to 2011. He began service with the House of Commons in 1967. He was appointed Principal Clerk in 1991 and served as secretary to the House of Commons Commission from 1995 to 2001. He then served as Clerk of the Journals (2001–03) and Clerk of Legislation (2003–06) before being appointed Clerk of the House of Commons in 2006. While in this office he was the editor of the 24th edition of Erskine May: Parliamentary Practice (2011). He was succeeded by Robert Rogers on 1 October 2011.
- Cambridge University Library catalogue entry for Erskine May: Parliamentary Practice (24th edition)
- Jones, Barbara; Owen, Glen. "Commons boss who called in police has four homes in three countries, including grace and favour mansion". Daily Mail (London).
- "Press Notice: Clerk of the House of Commons". number10.co.uk. 30 June 2011.
- House of Commons Debates 4 June 2011 c 677.
- The London Gazette: . 11 June 2011.
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