'Chief of staff' may refer to:
Military
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Chief of staff (military)
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Chief of the General Staff
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Chief of the Defence Staff is the senior member of the Canadian Forces
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Ramatkal, or Chief of the General Staff, the highest ranking officer in the Israeli General Staff
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''Chef des Stabes'', commander of the Nazi Sturmabteilung
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Chief of Staff of Irish Republican Army
United Kingdom military
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Chief of the Air Staff
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Chief of the Defence Staff
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Chief of the Imperial General Staff
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Chiefs of Staff Committee, the most senior military personnel in the British forces
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First Sea Lord or Chief of the Naval Staff
United States military
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Joint Chiefs of Staff of the United States military
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Chairman of the Joint Chiefs of Staff
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Chief of Staff of the United States Army
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Chief of Staff of the United States Air Force
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Chief of Staff of the United States Navy
Politics
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chief aide to a political leader
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Chef de Cabinet (UN) to the United Nations Secretary General
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White House Chief of Staff, the highest-ranking member of the Executive Office of the President of the United States
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Chief of Staff (United States Congress), the most senior staff member in the office of a member of the United States Congress
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Chief of Staff (United Kingdom), the head of the Prime Minister's Office in the United Kingdom
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Chief of Staff (Canada), the head of the Prime Minister's Office of Canada
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Chief of Staff (Philippines), the head of the Office of the President in the Philippines