Harold W. Massingham (25 October 1932 Mexborough—13 March 2011) was an English poet.
He was the son of H. W. Massingham (a collier from Mexborough). He attended the same Mexborough Grammar School as the Yorkshire poet and Poet Laureate Ted Hughes but in a class two years below. He taught at the University of Manchester; his students included Steven Waling, and Trevor Griffiths.
Harold Massingham lived in Mexborough through his childhood, and then Manchester from his university days, until moving with his wife Pat to Spain in the 1990s. He published three volumes of poetry in 1965, 1972 and 1992.
His work was published in The New Yorker, and Alhambra Poetry Calendar.
Under the pseudonym ‘Mass’ he set crosswords for national newspapers and magazines for more than 30 years. He also compiled chess puzzles.
- 1968 Cholmondeley Awards for Poets
- The Magician, Manchester: Phoenix Pamphlet Poets Press, 1969
- The Magician's Attic
- Black Bull Guarding Apples. London: Longmans. 1965. 
- Frost Gods, Macmillan, 1972
- Sonatas & Dreams, Littlewood Arc, 1992
- Selected Poems, Calder Valley Poetry, 2021
- John Matthews, ed. (October 1988). "The Finding of Merlin". An Arthurian Reader. Aquarian Press. ISBN 0-85030-778-3.
- "Tree-dream". The Poetry Book Society Anthology 1989-90. Hutchinson. October 1989. ISBN 978-0-09-173992-8.
- ^ Mike Poole & John Wyver, Powerplays: Trevor Griffiths in Television, 1984, London: BFI Publishing, p. 12
- ^ Ian McMillan, Vernon Scannell, Yorkshire Post, 23 November 2007
- ^ Jonathan Crowther (2006) A-Z of Crosswords, London: Collins ISBN 978-0-00-722923-9, ISBN 0-00-722923-2
- ^ "Farewell to 'Mass': Crossword king Harold Massingham dies, aged 78 | Manchester Evening News - menmedia.co.uk". menmedia.co.uk. Archived from the original on 12 November 2012.
- ^ Chris Jones, Strange likeness: the use of Old English in twentieth-century poetry, Oxford University Press, 2006