Assistant commissioner

In all Australian police forces, assistant commissioner is the rank below deputy commissioner but senior to the rank of commander (South Australia Police, Victoria Police), senior to the rank of superintendent (Western Australia Police and NSW Police Force) and senior to the rank of chief superintendent (Queensland Police Service). In all services, the insignia consists of crossed and wreathed tipstaves; as a rank, it is roughly equivalent to that of a brigadier or major-general in the army.

The rank of assistant commissioner is used by one police agency:

• Royal Canadian Mounted Police has 26 officers with the rank and is the third highest rank in the command structure of the force.

Hong Kong Police Force have two ranks for assistant commissioner:

• Senior Assistant Commissioner of Police (SACP)
• Assistant Commissioner of Police (ACP)

Insignia of an Indian Police officer with rank of deputy superintendent of police

In India, senior officers of the rank of assistant superintendent/assistant commissioner of police or above may belong to the national Indian Police Service or state police services, whereas Indian inspectors and constables belong to the individual provincial police forces. The rank of Assistant Commissioner is also used in Indian Income Tax, Customs, Central Excise and Service Tax Administration, as an officer of Indian Revenue

In Pakistan, an assistant commissioner is a rank of the Revenue Administration, which is of two sub-types: Land Revenue, coming from two services; Provincial Management Service (PMS) and Pakistan Administrative Service (PAS), and Income Tax or Inland Revenue. The assistant commissioner of Land Revenue is an official appointed at the sub-district level, responsible for managing land records, revenue receipts related to land transfer, water cess, and crop cess etc. The Assistant Commissioner is also given magisterial powers in the capacity of sub-divisional magistrate (SDM) to settle disputes. The CSS and PMS is an elite permanent bureaucratic authority and the civil service that is responsible for running the civilian bureaucratic operations and government secretariats and directorates of the Cabinet Secretariat. The civil service defines itself as "key wheels on which the entire engine of the state has to move." Derived from the colonial legacy of the former British Empire, the Assistant Commissioner selection is made after passing the CSS or PMS exam and including one’s name in PAS or PMS group respectively.

In Papua New Guinea, assistant commissioner is the rank between chief superintendent and deputy commissioner.

In Bangladesh, Assistant Commissioner is the entry level post of field Administration of the Administrative Service while the entry post of central Administration is Assistant Secretary. This rank is also used in other services like tax, customs and police, only in metropolitan areas such as Assistant Commissioner of Police (ACP). Assistant Commissioners play vital role in field administration. At first, they are posted at office of the Deputy Commissioner in District. They take part to deliver services to the people. As an Executive Magistrate, they also conduct mobile courts under the Mobile Court Act, 2009.

In the Garda Síochána, the Republic of Ireland's national police force, the rank of assistant commissioner is between chief superintendent and deputy commissioner.

In the New Zealand Police, the rank of assistant commissioner is junior to the rank of deputy commissioner and is senior to the rank of superintendent. assistant commissioner is the top rank that can be achieved by a sworn member other than by statutory appointment. There are currently five assistant commissioners with separate areas of responsibility.

Staff Department heads or Directors of the Singapore Police Force are led by Assistant Commissioners.

Metropolitan Police Assistant Commissioner Epaulette

Assistant commissioner of police of the metropolis (AC) is the third highest rank in the London Metropolitan Police, ranking between deputy assistant commissioner and deputy commissioner of police of the metropolis. The assistant commissioner is also the second-in-command of the City of London Police, ranking between commander and commissioner. The rank is not used in other British police forces, but is equivalent to chief constable.