Alexander George Richey (1830–1883) was an Irish barrister and historian.
He was the son of Alexander Richey of Mountemple, Coolock, County Dublin, and his wife, Matilda Browne, whose sister Margaret married Henry Caulfeild, father of the 3rd Earl of Charlemont.
He was educated at Dungannon Royal School, entered Trinity College, Dublin, in 1848, and was elected on the foundation in 1861.
In 1871 he was appointed deputy Regius Professor of Feudal and English Law at Trinity College; he was also vice-president of the Royal Irish Academy, and an auditor and prizeman of the College Historical Society.
He died at his residence, 27 Upper Pembroke Street, Dublin, on 29 November 1883, and was buried on 3 December in Mount Jerome cemetery.