Muircheartach Ó Cobhthaigh (; ) was an Irish poet, a member of the Ó Cobhthaigh clan of poets from County Westmeath. He is known as the author of six extant poems:
Le dís cuirthear clú Laighean Dlighidh liaigh leigheas a charad, one hundred and forty verses, (edited by Lambert McKenna in 1949) Mairg as dáileamh don digh bhróin, on the death of Garret Nugent, Baron of Delvin (NLI MS G 992 (Nugent Manuscript) f.33v) Do-ní clú áit oighreachda one hundred and twenty-four verses on William Nugent (MS G 992, f.34v) Geall re hairlachd ainm barúin on the death of Christopher Nugent, 14th Baron Delvin (MS G 992, f. 35v) Séd fine teisd Thoirrdhealbhaigh (edited by Ó Cróinín)
Other poems by him may yet survive but cannot now be ascribed.
References Some Irish bardic poems lxxxx, Lambert McKenna, Studies 38 (1949), 183–8. A poem to Toirdhealbhach Luinneach Ó Néill, Dáibhí Ó Cróinín, Éigse 16/1 (1975-6), 50–66. The Tinnakill dunaire, Anne Sullivan, Celtica 11, (1976), 214–28. A poem to Aodh Buidhe and Alasdar Mac Domhnaill of Tinnakill, Eoghan Ó Raghallaigh, Ossory, Laois and Leinster 2 (2006) Ó Cobhthaigh family, pp. 435–436, in Oxford Dictionary of National Biography, volume 41, Norbury-Osbourne, September 2004.