
The Canada Border Services Agency is a federal law enforcement agency that is responsible for border control, immigration enforcement, and customs services in Canada. The CBSA is accountable to Parliament through the Minister of Public Safety and Emergency Preparedness.

The Canadian Armed Forces, or Canadian Forces, are the unified armed forces of Canada, as constituted by the National Defence Act, which states: "The Canadian Forces are the armed forces of Her Majesty raised by Canada and consist of one Service called the Canadian Armed Forces."

The Canadian Coast Guard is the coast guard of Canada. Formed in 1962, the coast guard is tasked with marine search and rescue, communication, navigation and transportation issues in Canadian waters, such as navigation aids and icebreaking, marine pollution response and providing support for other Canadian government initiatives. The coast guard operates 119 vessels of varying sizes and 22 helicopters, along with a variety of smaller craft. The CCG is headquartered in Ottawa, Ontario, and is a special operating agency within Fisheries and Oceans Canada.

The Canadian Defence Academy ("CDA") is an organization located within the Canadian Forces created in 2000. The academy is situated within the Military Personnel Command. CDA is comprised several training institutes such as the Royal Military College of Canada, Canadian Forces College and the Royal Military College Saint-Jean.

The Canadian Forces Military Police provide police, security and operational support services to the Canadian Armed Forces (CF) and the Department of National Defence (DND) worldwide.

The Correctional Service of Canada, also known as Correctional Service Canada or Corrections Canada, is the Canadian federal government agency responsible for the incarceration and rehabilitation of convicted criminal offenders sentenced to two years or more. The agency has its headquarters in Ottawa, Ontario.

The North-West Mounted Police (NWMP) was a Canadian police force, established in 1873 by the Prime Minister, Sir John Macdonald, to maintain order in the North-West Territories. The mounted police combined military, police and judicial functions along similar lines to the Royal Irish Constabulary, and deployed the following year to the Alberta border in response to the Cypress Hills Massacre and subsequent fears of a United States military intervention. Their ill-planned and arduous journey of nearly 900 miles (1,400 km) became known as the March West and was portrayed by the force as an epic journey of endurance. Over the next few years, the police extended Canadian law across the region, establishing good working relationships with the First Nations. The force formed part of the military response to the North-West Rebellion in 1885, but faced criticism for their performance during the conflict.

Parks Canada, is an agency of the Government of Canada run by a chief executive who answers to the Minister of the Environment and Climate Change. Parks Canada is mandated to "protect and present nationally significant examples of Canada's natural and cultural heritage, and foster public understanding, appreciation, and enjoyment in ways that ensure their ecological and commemorative integrity for present and future generations". Parks Canada manages 38 National Parks, three National Marine Conservation Areas, 171 National Historic Sites, one National Urban Park, and one National Landmark. The agency also administers lands and waters set aside as potential national parklands, including eight National Park Reserves and one National Marine Conservation Area Reserve. More than 450,000 km2 (170,000 sq mi) of lands and waters in national parks and national marine conservation areas has been set aside for such purposes. The Canadian Register of Historic Places is supported and managed by Parks Canada, in collaboration with provincial and territorial governments and other federal bodies. The agency is also the working arm of the national Historic Sites and Monuments Board, which recommends National Historic Sites, Events, and Persons.

The Royal Canadian Mounted Police is the federal and national police service of Canada, providing law enforcement at the federal level. The RCMP also provides provincial policing in eight of Canada's provinces and local policing on a contract basis in the three territories and more than 150 municipalities, 600 Indigenous communities, and three international airports. The RCMP does not provide active provincial or municipal policing in Ontario or Quebec. However, all members of the RCMP have jurisdiction as a peace officer in all parts of Canada, not including Ontario and Quebec except for federal laws. Despite the name, the Royal Canadian Mounted Police is no longer an actual mounted police force, with horses only being used at ceremonial events.