Mark Laurence James Blatchly (born 1960) is an English organist and composer.Watkins Shaw, The Succession of Organists of the Chapel Royal and the Cathedrals of England and Wales from c.1538, Oxford University Press (1991).

Born in Shepton Mallet, Blatchly was an organ student at St Paul's Cathedral.Marc Rochester, Gramophone, Remembrance. Retrieved 13 November 2020. He was assistant organist at Gloucester Cathedral,MusicSpoke, Composer interview: Matthew Cann, 19 January 2015. Retrieved 13 November 2020. and a music teacher and organist at Charterhouse until his retirement in 2018.

His best known work is a setting of For the Fallen,"For the Fallen" by Mark Blatchly, recorded by St Paul's Cathedral Choir, John Scott (conductor), Huw Williams (organ), John McDomnic (trumpet) www.hyperion-records.co.uk, accessed 17 December 2019. which has been recorded by several cathedral choirs for Remembrance services.

As organist, he has been recorded both in solo rolesOrgan Music For Fun...again / Mark Blatchly www.arkivmusic.com, accessed 17 December 2019. and as part of larger ensembles.Britten: Choral Works & Operas for Children www.prestomusic.com, accessed 17 December 2019.

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