| Greg Tegart | |
| Office1: | Secretary of the Department of Science and Technology |
| Term Start1: | 24 December 1981 |
| Term End1: | 13 December 1984 |
| Office2: | Secretary of the Department of Science |
| Term Start2: | 13 December 1984 |
| Term End2: | 24 July 1987 |
| Birth Name: | William John McGregor Tegart |
| Birth Date: | 27 March 1929 |
| Occupation: | Academic and public servant |
| Nationality: |  Australian |
| Alma Mater: | University of Melbourne RMIT University University of Sheffield |
William John McGregor "Greg" Tegart (27 March 1929 – 4 July 2023) was Australian senior public servant. He was latterly an adjunct professor at Victoria University.
William John McGregor Tegart was born on 27 March 1929. He was educated at the Royal Melbourne Institute of Technology, University of Melbourne and University of Sheffield.
Tegart first joined the Australian Public Service in 1947 as Laboratory Assistant and Technical Officer with the Commonwealth Scientific and Industrial Research Organisation.
Tegart was appointed Secretary of the Department of Science and Technology in 1981.[1]
Tegart retired from the public service in 1993.
Tegart died on 4 July 2023, at the age of 94.[2]
In June 1990, Tegart was made a Member of the Order of Australia in recognition of service to science and technology.
Tegart was a Foundation Fellow of the Australian Academy of Technological Sciences and Engineering.