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Liam Ó Dúgáin was an Irish scribe who flourished in the mid-19th century.

A native of Claregalway, Ó Dúgáin was a relation of Tomás Bacach Ó Dúgáin and Maolsheachlainn Ó Dúgáin, all of the same parish. His scribal work consists of songs.

• Seán Mór Ó Dubhagáin (died 1372), Gaelic-Irish poet.
• Patrick Duggan (10 November 1813 – 15 August 1896), Roman Catholic Bishop of Clonfert.
• Seánie Duggan (1922–2013), retired Irish sportsman.
• Jeremiah Duggan (1980–2003), British student who died in disputed circumstances linked to the LaRouche movement.

• Scríobhaithe Lámhscríbhinní Gaeilge I nGaillimh 1700-1900, William Mahon, in "Galway:History and Society", 1996