| Flann Ó Riain | |
| Birth Date: | 18 September 1929 |
| Birth Place: | Lucan, County Dublin, Ireland |
| Death Place: | Tipperary, County Tipperary, Ireland |
| Occupation: | Cartoonist, writer, Irish language activist, teacher |
| Spouse: | Norita Collins[1] |
| Partner: | Annette McHugh |
Flann Ó Riain (18 September 1929 – 6 December 2008[2]) was an Irish cartoonist, writer and Irish language activist. He was born on 18 September 1929 in Lucan, County Dublin. He was primarily known for his work as a political cartoonist with the Irish Independent newspaper. Using the nom de plume "Doll", he appeared regularly in the newspaper, where he created satirical cartoons. He was also known as creator of the 1960s Irish language television series Irish: [[Dáithí Lacha]], and Irish: Rí Rá agus Ruaille Buaille.
Ó Riain was born in Lucan, Dublin to Edmund and Nora Ryan. His father, a member of the Garda Síochána (police), took a posting in Arranmore, County Donegal in order to foster his son's interest in the Irish language. From there, he attended numerous national schools throughout the country. From school, he attended St Patrick's College, Dublin graduating as a primary school teacher.
In 1977, he was confined in Mountjoy Prison having been fined for refusing to pay his television licence in protest at what he saw as RTÉ's neglect of the Irish language. He was subsequently released after the fine was paid anonymously.
He also was a writer of books on history and language.