Sir David Petrie KCMG CIE CVO CBE KPM (9 September 1879 – 7 August 1961) was Director General (DG) of MI5, the United Kingdom's internal security service, from 1941 to 1946.

After the outbreak for the World War II he joined the Army Intelligence Corps.

[2] His highest level in British India was to chair the Union Public Service Commission.

His task was to reorganise the service so that it could improve its efficiency.

[3] He was awarded Order of the Yugoslav Crown and other decorations.