Baron Trevethin, of Blaengawney in the County of Monmouth, is a title in the Peerage of the United Kingdom. It was created in 1921 for the prominent judge Sir Alfred Lawrence, Lord Chief Justice of England from 1921 to 1922. His third son the Hon. Geoffrey Lawrence was also a noted jurist and served as the main British judge at the Nuremberg trials. In 1947 he was himself raised to the peerage as Baron Oaksey, of Oaksey in the County of Wilts. In 1959 he succeeded his elder brother as third Baron Trevethin, although he continued to be known as Lord Oaksey. As of 2010[update] the titles are held by his only son, the fourth Baron Trevethin and second Baron Oaksey, who succeeded in 1971. He is a well-known horse racing journalist. Like his father he is known simply as Lord Oaksey.
The heir apparent is the present holder's only son the Hon. Patrick John Tristram Lawrence (b. 1960)
see above for further holders