| Honorific-Prefix: | The Right Honourable |
| The Lord Trevethin | |
| Honorific-Suffix: | KC |
| Office1: | Member of the House of Lords |
| Status1: | Lord Temporal |
| Term Label1: | as an elected hereditary peer |
| Term Start1: | 22 October 2015 |
| 1Blankname1: | By-election |
| 1Namedata1: | 22 October 2015 |
| Predecessor1: | The 2nd Viscount Montgomery of Alamein |
| Birth Name: | Patrick John Tristram Lawrence |
| Birth Date: | 29 June 1960 |
| Children: | 3 |
| Alma Mater: | Christ Church, Oxford |
| Occupation: | Barrister |
| Party: | Crossbench |
| Parents: | John Oaksey, Victoria ("Tory") Lawrence (nee. Dennistoun) |
Patrick John Tristram Lawrence, 5th Baron Trevethin and 3rd Baron Oaksey, (born 29 June 1960) is a British barrister, hereditary peer and crossbench member of the House of Lords. He was educated at Christ Church, Oxford.[1]
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.[2]
In 1987 he married Lucinda, a daughter of businessman Demetri Marchessini. They have a son and two daughters.[3]
He is the son of artist Tory Lawrence and aristocrat John Oaksey, who split in public fashion[4] in the mid-1980s when Tory Lawrence began a relationship with artist Maggi Hambling.[5]
| Escutcheon: | Per chevron Argent and Gules two crosses raguly in chief of the last and a lamb in base holding with the dexter foreleg a banner and staff all of the first the banner charged with a cross couped Azure. |
| Crest: | A dragon's head erased Sable between two bugle horns counter-embowed Or. |
| Supporters: | On either side a dragon Sable winged and charged on the shoulder with a fasces Or. |
| Motto: | Pur Fel Dur [6] |