| Honorific-Prefix: | Sir |
| Brian Freeston | |
| Order: | 43rd |
| Office: | Governor of the Leeward Islands |
| Term Start: | 1943 |
| Term End: | 1947 |
| Predecessor: | Sir Douglas Jardine |
| Successor: | W. R. Macnie (Acting) |
| Order1: | 16th |
| Office1: | High Commissioner for the Western Pacific |
| Monarch1: | George VI |
| Term Start1: | 1945 |
| Term End1: | 21 March 1947 |
| Predecessor1: | Sir John Rankine (Acting) |
| Successor1: | John Fearns Nicoll (Acting) |
| Order2: | 18th |
| Office2: | Governor of Fiji |
| Monarch2: | George VI |
| Term Start2: | 1 January 1945 |
| Term End2: | 21 March 1947 |
| Predecessor2: | Sir John Rankine (Acting) |
| Successor2: | John Fearns Nicoll (Acting) |
| Order3: | 2nd |
| Office3: | Secretary General of the Pacific Commission |
| Term Start3: | 12 November 1951 |
| Term End3: | 12 November 1954 |
| Predecessor3: | William D. Forsyth |
| Successor3: | Ralph Clairon Bedell |
| Birth Date: | 11 August 1892 |
| Birth Place: | Brentford, Middlesex, England |
| Death Place: | Bromley, Kent, England |
| Birthname: | Leslie Brian Freeston |
| Nationality: | British |
| Serviceyears: | 1914-1919 |
| Rank: | Captain |
| Unit: | London Regiment |
Sir Leslie Brian Freeston (11 August 1892 – 16 July 1958) was a British colonial official.
Freeston was educated at Willaston School and New College, Oxford. After service in the London Regiment of the British Army in the First World War he joined the then Colonial Office in 1919. He was Governor of the Leeward Islands 1944–48; Governor of Fiji and High Commissioner, Western Pacific 1948–52; Secretary-General of the South Pacific Commission 1951–54. Freeston was knighted on 1 January 1945.