Patrick John Tristram Lawrence, 5th Baron Trevethin and 3rd Baron Oaksey, (born 29 June 1960) is a British barrister, hereditary peer and former member of the House of Lords who sat as a crossbencher. He was educated at Christ Church, Oxford.
He is a barrister practising from 4 New Square Chambers and was elected to sit in the House at a crossbench hereditary peers' by-election in October 2015, following the retirement of David Montgomery, 2nd Viscount Montgomery of Alamein.
In 1987 he married Lucinda, a daughter of businessman Demetri Marchessini. They have a son and two daughters.
He is the son of Tory Lawrence and John Oaksey, who split in public fashion in the mid-1980s when Tory Lawrence began a relationship with artist Maggi Hambling.