Four-star rank

four-starGeneralfour-star generalOF-9admiralfour starfour-star admiralfour-star officer4-star rankfour star general
A four-star rank is the rank of any four-star officer described by the NATO OF-9 code.wikipedia
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Air chief marshal

ACMAir Chief MarshallAir Chf Mshl
Four-star officers are often the most senior commanders in the armed services, having ranks such as (full) admiral, (full) general, or air chief marshal.
Air chief marshal (Air Chf Mshl or ACM) is a four-star air officer rank which originated in and continues to be used by the Royal Air Force, where it is the most senior peacetime air force rank.

Admiral

Adm.admiralsAdm
Four-star officers are often the most senior commanders in the armed services, having ranks such as (full) admiral, (full) general, or air chief marshal.
In NATO, admirals have a rank code of OF-9 as a four-star rank.

General (Australia)

Generalarmy general
General (abbreviated GEN) is the second-highest rank, and the highest active rank, of the Australian Army and was created as a direct equivalent of the British military rank of general; it is also considered a four-star rank.

Marshal of the air force

Marshal of the Indian Air ForceMarshalMarshal of the Royal Malaysian Air Force
In times of major conflict, the highest ranks are the five-star ranks: admiral of the fleet, field marshal, and marshal of the Royal Australian Air Force.
While the air forces of the former Soviet Union had ranks named chief marshal of the aviation branch (or "chief marshal of the air force") and marshal of the aviation branch (or "marshal of the air force"), these were four-star and three-star ranks, respectively (and therefore equivalent to the less senior RAF ranks of Air Chief Marshal and Air Marshal respectively).

Chief of the Defence Force (Australia)

Chief of the Defence ForceChief of the Australian Defence ForceChief of the Defence Force Staff
The four-star rank is reserved in Australia for the Chief of the Defence Force, the highest position in peacetime.
During peacetime, the Chief of the Defence Force is the only four-star officer in the ADF (admiral, general, or air chief marshal).

General (Germany)

GeneralGeneralleutnantGeneral-Leutnant
As a four-star rank it is the equivalent to the rank of admiral in the German Navy.

Indian Army

ArmyIndianIndia
The President of India is the Supreme Commander of the Indian Army, and it is commanded by the Chief of Army Staff (COAS), who is a four-star general.

Army general (East Germany)

ArmeegeneralArmy GeneralEast German officers
Not to be confused with Generaloberst, the Wehrmacht equivalent until 1945, or Armeegeneral, the National People's Army (East Germany) equivalent until 1990.
Army general (Armeegeneral), was in the so-called armed organs of the GDR (Bewaffnete Organe der DDR), represented by Ministry of National Defence, Ministry for State Security, and Ministry of Interior, the highest general officer peace times rank, comparable to the four-star rank in many NATO-Armed forces (Rangcode OF-9).

Chief of the Army Staff (India)

Chief of Army StaffChief of the Army StaffChief of Army Staff of the Indian Army
The position is abbreviated as COAS in Indian Army, and is always held by a full general.

Director of the Intelligence Bureau

Director of Intelligence BureauDirectorDirector of Intelligence Bureau (India)
Being a Four star post, the DIB is the senior-most Indian Police Service officer.

Indian Navy

NavyIndian navalIndia
The Chief of Naval Staff, a four-star admiral, commands the navy.

Admiral (Germany)

AdmiralAdmiral (Kriegsmarine)Admirals
In the German Navy Admiral is, as in many navies, a four-star rank with a NATO code of OF-9.

Indian Air Force

Royal Indian Air ForceAir ForceIAF
The Chief of Air Staff, an air chief marshal, is a four-star officer and is responsible for the bulk of operational command of the Air Force.

Five-star rank

OF-10five-starfive-star general
In times of major conflict, the highest ranks are the five-star ranks: admiral of the fleet, field marshal, and marshal of the Royal Australian Air Force.
During World War II and after, serving NATO, a small number of British five-star commanders have held the additional title Supreme Allied Commander, given operational control over all air, land, and sea units led by the four-star commanders of multi-national forces.

Chief of the Naval Staff (India)

Chief of the Naval StaffChief of Naval StaffChief of Naval Staff of the Indian Navy
The position is abbreviated CNS in Indian Navy cables and communication, and is always held by a full admiral.

Generaloberst

Colonel GeneralColonel-GeneralGeneral
Not to be confused with Generaloberst, the Wehrmacht equivalent until 1945, or Armeegeneral, the National People's Army (East Germany) equivalent until 1990.
Rank insignia of the German Empire 1871 until 1918, here shoulder strap of the German Imperial Army: twisted of silver- and golden-braids with three stars to "Colonel general" (equivalent to four-star rank, today: OF-9).

General (Canada)

Generalgeneral officersGeneral/''général
The rank is referred to as "four-star", a reference to its American equivalent.

Chairman Joint Chiefs of Staff Committee

Chairman joint chiefsChairmanChairman of the Joint Chiefs of Staff Committee
The Chairman Joint Chiefs of Staff Committee (CJCSC) is, in principle, the highest-ranking and senior most military officer, typically at four-star rank, in the Pakistan Armed Forces who serves as a principal military adviser to the civilian government led by elected Prime minister of Pakistan and his/her National Security Council.

Pakistan Air Force

PAFAir ForcePakistani Air Force
The Chief of Air Staff (CAS), by statute a four-star air officer Air Chief Marshal, is appointed by the President with the consultation and confirmation needed from the Prime Minister of Pakistan.

Pakistan Army

Pakistani ArmyArmyarmy general
The Pakistan Army is commanded by the Chief of Army Staff, by statute a four-star rank general, who is senior member of the Joint Chiefs of Staff Committee is appointed by the Prime Minister and confirmed by the President of Pakistan.

Brazilian Army

ArmyNational GuardBrazil
The senior-most commissioned rank in the Brazilian Army is the "General de Exército" (Army General), a "four-star" general.

Admiral (Royal Navy)

AdmiralRear Admiral of the BlueAdmiral of the Blue
Admiral is a senior rank of the Royal Navy of the United Kingdom, which equates to the NATO rank code OF-9, outranked only by the rank of admiral of the fleet.