Maidhc Dainín Ó Sé (2 February 1942 – 29 August 2013) was an Irish writer and musician.

He wrote exclusively in the Irish language, and is best known for his autobiography, A Thig Ná Tit Orm.

He was the father of the television presenter Dáithí Ó Sé.

He was the son of a fisherman from Baile na nGall called Dainín Dan Ó Sé and his wife from an Daingean, Máire Ní Chinnéide.

His writings were used as part of the Irish-language element of the Leaving Certificate in Irish state education, as a replacement for Peig from 1995.