Sir Marcus Alexander Smith (born 1 July 1967[1]) is a British High Court judge.

[1] He was called to the bar at Lincoln's Inn in 1991 and practised commercial and regulatory law from Fountain Court Chambers, where he also completed his pupillage.

[5] On 12 January 2017, he was appointed as a High Court judge and assigned to the Chancery Division.

[2] From 2019 to 2021, he was the Business and Property Courts Supervising Judge for the Midlands and Western circuit.

[2] On 09 August 2024, he was issued with a reprimand for serious misconduct by the Lady Chief Justice and the Lord Chancellor for giving a love letter to a junior member of staff.