| Honorific-Prefix: | The Honourable |
| Senator for Victoria | |
| Term Start: | 29 March 1901 |
| Term End: | 31 December 1903 |
| Office2: | Member of the Victorian Legislative Assembly |
| Constituency2: | Carlton South |
| Term Start2: | 1 May 1895 |
| Term End2: | 1 September 1897 |
| Predecessor2: | William Ievers |
| Successor2: | James Moloney |
| Birth Date: | 1858 12, df=yes |
| Birth Place: | Carlton, Colony of Victoria |
| Death Place: | Melbourne, Victoria, Australia |
| Nationality: | Australian |
| Party: | Labor |
| Alma Mater: | St Mary's Anglican School, Hotham |
| Occupation: | Tinsmith, unionist |
John George Barrett (17 December 1858 - 19 May 1928) was an Australian politician, a senator in the federal Australian parliament.
Born in Carlton, Barrett was educated there at St Mary's Anglican School before becoming apprenticed as a tinsmith. He was founder and President of the Tinsmith's Society, and also served as President of the Melbourne Trades Hall Council. In 1895, he was elected to the Victorian Legislative Assembly as the member for Carlton South,[1] where he remained until 1897. In 1901, he was elected to the Australian Senate as a Labor Senator from Victoria, although he was also endorsed by the Protectionist Party. He was one of only three Labor members elected to the first Parliament from Victoria (the other two were members of the House of Representatives, Frank Tudor and James Ronald). He was defeated in 1903,[2] but continued to be active in the union movement; he was also an active prohibitionist. Barrett died in 1928.[3]