James Green Douglas (11 July 1887 – 16 September 1954) was an Irish businessman and politician.

[1] In 1922 Douglas served as the first-ever Leas-Chathaoirleach (deputy chairperson) of Seanad Éireann, the upper house of the newly independent Irish parliament.

He was the eldest of nine children of John Douglas (1861–1931), originally of Grange, County Tyrone, and his wife, Emily (1864–1933), daughter of John and Mary Mitton of Gortin, Coalisland, County Tyrone.

[3] On 14 February 1911, Douglas married Georgina (Ena) Culley (1883–1959), originally of Tirsogue, Lurgan, County Armagh.

Douglas went on to become a very active member of Seanad Éireann between 1922 and 1936 under the constitution he had helped to prepare.