Seán Mac Giollarnáth

Seán Mac Giollarnáth (1880-29 January 1970) was an Irish folklorist.

A native of Coill an Bhogaigh, Gurteen, Ballinasloe, Mac Giollarnáth lived for a time in London before moving to Dublin where he taught at St. Enda's, Rathfarnham. From 1909 to 1916 he was editor of An Claidheamh Soluis. He acted as a courier for the Old I.R.A. during the Irish War of Independence. In 1923 he was appointed District Justice, which he held till he retired in 1950.

He held a lifelong interest in wildlife and folklore, which formed the basis for much of his published work. He was awarded an LL.D by the National University of Ireland in the 1960s.