Sir Samuel Pethebridge
|Secretary of the Department of Defence|
|Preceded by||Sir Muirhead Collins|
|Succeeded by||Thomas Trumble|
|Born||3 August 1862|
Spring Hill, Queensland
|Died||26 January 1918 (aged 55)|
|Branch/service||Queensland Marine Defence Force|
|Years of service||1893–1903|
Brigadier General (Army)
|Battles/wars||First World War|
|Awards||Knight Commander of the Order of St Michael and St George|
Brigadier General Sir Samuel Augustus Pethebridge,(3 August 1862 – 26 January 1918) was senior Australian public servant, serving as the Secretary of the Department of Defence in the period 1910–1918. He was acting Secretary for Sir Muirhead Collins (1906–1910). He was also a military administrator, and an army officer.
Pethebridge died, in office and holding rank as brigadier general, in 1918 aged fifty-five, and was buried at Box Hill Cemetery, Melbourne.