| Sir John Knott | |
| Office1: | Secretary of the Department of Defence Production |
| Term Start1: | 8 August 1957 |
| Term End1: | 23 April 1958 |
| Office2: | Secretary of the Department of Supply |
| Term Start2: | 13 October 1959 |
| Term End2: | 12 March 1966 |
| Office3: | Director-General of the Postmaster-General's Department |
| Term Start3: | 12 December 1968 |
| Term End3: | 14 January 1972 |
| Birth Name: | John Lawrence Knott |
| Birth Date: | 6 July 1910 |
| Birth Place: | Romsey, Victoria |
| Occupation: | Public servant |
| Nationality: |  Australian |
| Alma Mater: | University of Melbourne |
Sir John Lawrence Knott (6 July 19101999) was a senior Australian public servant. He was Director-General of the Postmaster-General's Department from 1968 to 1972. Afterwards he was appointed a company director in private industry.
Knott was born in Romsey, Victoria on 6 July 1910.
Between August 1957 and April 1958, Knott headed the Department of Defence Production.
He was Secretary of the Department of Supply between 1959 and 1966. During his time in the role, he accompanied Minister for Supply Allen Fairhall overseas visiting the United Kingdom and the United States on departmental business.[1]
In 1966, Knott was appointed Deputy High Commissioner London. At the end of his term in November 1968, when he had been already appointed to head the Postmaster-General's Department starting the following month, Knott attended the UN World Space Conference in Vienna.[2]
Between December 1968 and January 1972, Knott was Director-General of the Postmaster-General's Department.
In 1972, Knott was appointed to the board of Equity Trustees and Agency Co Ltd.[3]