Tomás Bán Ó Conceanainn (16 November 1870 – 20 April 1961; Thomas Concannon) was an Irish writer and historian.
Returning to Ireland in 1898 on holiday he became involved with the Gaelic League, so much so that he remained in the country as one of its organisers.
On a 1905 journey to the USA with Douglas Hyde, they collected twenty thousand dollars.
In 1912 Patrick Pearse attempted to persuade him to recruit backers for Pearse's boys' and girls' bilingual Montessori secondary schools Scoil Éanna and Scoil Íde, on a percentage basis, but he declined; Seán T. O'Kelly took on the work.
[1] Concannon's nephew, Brian Seoighe, was a student in Scoil Éanna.