The Namibian Defence Force (NDF) comprises the national military forces of Namibia. It was created when the country, then known as South West Africa, gained independence from apartheid South Africa in 1990. Chapter 15 of the Constitution of Namibia establishes the NDF and defines its role and purpose as, " ... to defend the territory and national interests of Namibia".

Namibia's military was born from the integration of the formerly belligerent People's Liberation Army of Namibia (PLAN), military wing of the South West African People's Organization, and the South West African Territorial Force (SWATF) – a security arm of the former South African administration. The British formulated the force integration plan and began training the NDF, which consisted of five battalions and a small headquarters element. The United Nations Transitional Assistance Group (UNTAG)'s Kenyan infantry battalion remained in Namibia for three months after independence to assist in training the NDF and stabilize the north. Martin Shalli and Charles 'Ho Chi Minh' Namoloh were involved in the negotiations that allowed the Kenyan infantry battalion to remain for that period.

The main roles of the Namibian Defence Force are to ensure the sovereignty and territorial integrity of the country by guarding against external aggression, both conventional and unconventional; prevent violation of Namibia's territorial integrity; and assist civil authorities in guarding and protecting government buildings and key installations as provided in the Defence Act.

Defence spending and percentage of GDP included $90 million in 1997/98, 2.6% of GDP. The 73.1 million figure in 2002 was 2.4% of GDP. These figures are almost certainly CIA World Factbook estimates.

Major General A W Dennis, CB, OBE (rtd), British Army, previously Director of Military Assistance Overseas, made the following comments on the initial phase in Namibia at a conference in Pretoria, South Africa on 6 August 1992:

You will no doubt recall that the Angola Accords were signed in Luanda on 22 December 1988. In November 1989 SWAPO won 57% of the votes in the Namibian General Election and immediately requested the help of a British Military Advisory and Training Team following independence on 21 March 1990. The team, initially 55 strong, was duly deployed on 26 March 1990 and the first leader's cadre, for the 1st and 2nd Battalions, was run from 17 April to 2 June. By 1 July, the 1st Battalion, about 1,000 men strong, accompanied by 5 BMATT Advisors, had deployed to the northern border. By November 1990, only four months later, the 5th Battalion had deployed and in early 1991 the 21st Guards Battalion had also been formed, four staff courses had been run, and support weapons and logistics training was well advanced (indeed a logistics battalion deployed as early as July 1990) and an operational test exercise had been conducted. In addition, the Ministry of Defence, a mixture of civilian and military personnel, was operating as a department of state. No one would pretend that everything was working perfectly, nevertheless, a great deal had been achieved in the first year following independence. Most people would probably agree that at some 7,500 strong the Army is unnecessarily large, but sensible plans will need to be made for the employment of any surplus soldiers before they are discharged. Integration has not been easy to achieve, at least in part, because of the need to use several interpreters to cope with the wide variety of languages involved. Battalions are made up of approximately 70% ex-PLAN and 30% ex-SWATF. This mixture could have proved explosive but hounded by their BMATT instructors they united in a common task (or perhaps in the face of a common enemy!) and soon realised that they could work well together. At the higher levels, integration has been more patchy, at least in part because of the departure of most white South African and SWATF officers. But the Government's intentions seem clear in that it decided to split the four MOD directorates evenly, appointing two white and two black (ex-PLAN) directors. In all this, BMATT Namibia has played a role remarkably similar to that of BMATT Zimbabwe.

The Chief Of Defence Force is the highest-ranking officer and exercises overall executive command of the force.Service chiefs are two-star general officers, air officers and flag officers in command of their respective arms of service. The Departments are also led by Major General's such as the Joint Operations Department. The rest of the general stuff is organised into eight Directorates led by one-star grade general officers, air officers and flag officers.

The Chief of the Defence Force (Namibia) is always a commissioned three star General/Air/Flag Officer from the officer corps. The first chief of the NDF was Lieutenant-General Dimo Hamaambo. He was previously the leader of PLAN. Lieutenant-General Solomon Hawala replaced Hamaambo as Chief of the NDF on Hamaambo's retirement. After Lieutenant-General Hawala retired in October 2006, Lieutenant General Martin Shalli then headed the NDF.