Dominic Robert Andrew Johnson, Baron Johnson of Lainston, CBE (born 6 April 1974), is a British financier, hedge fund manager and politician, the co-founder and chief executive officer (CEO) of Somerset Capital Management, who serves as co-chairman of the Conservative Party since November 2024, alongside Nigel Huddleston MP.

Johnson's maternal uncle, Nicholas Craig-Harvey, is married to Lady Julia, a daughter of the Conservative politician Hugh Percy, 10th Duke of Northumberland, and maternal granddaughter of Walter Montagu Douglas Scott, 8th Duke of Buccleuch, who as Earl of Dalkeith sat in the House of Commons.

[8] Johnson's mother, aged twenty seven, was found guilty of manslaughter on grounds of diminished responsibility, and sent to Rooksdown Hospital in Hampshire; she was subsequently released and later remarried to Dr Ivan Brumpt.

[13] In September 2022, SCM with assets under management of about $5 billion was up for sale, with Johnson planning to move into politics, and would be succeeded by chief operating officer Robert Diggle as CEO.

[12] In the 2017 New Year Honours, Johnson was appointed a Commander of the Order of the British Empire (CBE) "for political service".