William Tytler WS FRSE (1711–1792) was a Scottish lawyer, known as a historical writer. He wrote An Inquiry into the Evidence against Mary Queen of Scots, against the views of William Robertson. He discovered the manuscript the "Kingis Quhair" (King's Work), a poem of James I of Scotland. In 1783 he was one of the joint founders of the Royal Society of Edinburgh.
thumb|William Tytler
thumb|275px|The Fraser Tytler family vault, Greyfriars Kirkyard
Life
The son of Alexander Tytler, a lawyer ("writer") in Edinburgh, and Jane Leslie of Aberdeen, he was born on 12 October 1711. He was educated at Edinburgh high school and studied law at the University of Edinburgh, and was apprenticed as a lawyer to William Forbes. He qualified in 1744 as a writer to the signet (WS) and set up his own legal practice in Edinburgh. He was successful in his profession, and acquired the estate of Woodhouselee near Roslin on the south of the Pentland Hills.
Tytler was interested in archaeology and history. He joined the Select Society founded by Allan Ramsay the painter, in 1754, and took part in its debates. His prescription for a happy old age has been often quoted: "short but cheerful meals, music, and a good conscience".
His first recorded address (1773) is Campbell's Close off the Grassmarket in south-west Edinburgh.
He died at Woodhouselee on 12 September 1792. He was an accomplished player on the harpsichord and on the flute, and was an original member of the Musical Society of Edinburgh. Christ's Kirk on the Green, a comic ballad, which Tytler also attributed to James, is now thought to be of a later date.
His son Lt Col Patrick Tytler married Isabella Erskine, daughter of James Erskine, Lord Alva (one of his legal colleagues).