Liam de Róiste (born William Roche; 15 June 1882 – 15 May 1959) was an Irish Sinn Féin politician, diarist and Gaelic scholar.

[1] He was born in Fountainstown, County Cork,[2] the son of Edward Roche (originally from Tipperary) and Eliza Ahern, who were both primary school teachers.

A prominent early member of the Irish Volunteers movement, he took part in the march to Macroom on Easter Sunday 1916 and later in helping to smuggle arms for the IRA.

A personal friend and Catholic priest, James O'Callaghan, evidently mistaken for his host, was shot and killed while investigating the disturbance downstairs.

In the "lead up" to the Irish Civil War, he tried, as part of a group, to reconcile the pro- and anti-Treaty sides, a move that alienated many of his supporters, which effectively ended his political career.