Seán Mag Fhloinn () was an Irish scribe.
Mag Fhloinn was a native of Cummer, County Galway. His transcriptions included songs attributed to Antoine Ó Raifteirí, poems by Thomas Moore, and grammar.
References Scríobhaithe Lámhscríbhinní Gaeilge I nGaillimh 1700-1900, William Mahon, in "Galway: History and Society", 1996