The All Blacks are New Zealand's national team in rugby union, which is the country's national sport. The All Blacks are a formidable force in international rugby and have a winning record against every international rugby team, including the British and Irish Lions and the World XV. The All Blacks compete annually with the Australian rugby team (the Wallabies), and the South African rugby team (the Springboks), in the Tri-Nations Series, in which they also contest the Bledisloe Cup with Australia. The All Blacks have been Tri-Nations champions eight times in the tournament's eleven-year history, and twice completed a Grand Slam (in 1978 and in 2005), and currently hold the Bledisloe Cup. According to the official IRB World Rankings, the All Blacks are ranked second in the world behind current world champions South Africa. The All Blacks were also named the 2006 International Rugby Board (IRB) Team of the Year. Fourteen former All Blacks have been inducted into the International Rugby Hall of Fame, and one has been inducted into the IRB Hall of Fame.

The team first competed internationally in 1884 against Cumberland County, New South Wales, and played their first Test match in 1903, a victory against Australia. This was soon followed by a tour of the northern hemisphere in 1905, during which the team's only loss was to Wales in Cardiff.

The All Blacks completed their first series win over arch-rivals South Africa ("The Springboks") in New Zealand in 1956. A decade later, they achieved their longest winning streak by winning seventeen Tests between 1965 and 1970. The British and Irish Lions achieved their only series victory over the All Blacks in 1971, but seven years later the All Blacks completed their first Grand Slam (wins over England, Ireland, Scotland, and Wales on the same tour).

The 1981 Springbok Tour to New Zealand caused large-scale civil unrest due to protests over South Africa's apartheid policy. In 1987 New Zealand hosted and won the inaugural Rugby World Cup. New Zealand toured post-apartheid South Africa in 1996, and achieved their first series win on South African soil.

Early New Zealand national rugby uniforms consisted of a black jersey with a silver fern and white knickerbockers. By their 1905 tour the All Blacks were wearing all black, except for the silver fern, and their All Black name dates from this time. The All Blacks traditionally perform a haka (Māori posture dance) before each match. Traditionally, the haka performed is Te Rauparaha's Ka Mate, though since 2005, Kapa o Pango, a modified version of the 1924 All Blacks haka, Kia Whaka-ngawari, has occasionally been performed.