The Leopard (or Leopard 1) is a main battle tank designed and produced in West Germany that first entered service in 1965. Developed in an era when HEAT warheads were thought to make conventional heavy armour of limited value, the Leopard focussed on firepower in the form of the German-built version of the British L7 105-mm gun, and improved cross-country performance that was unmatched by other designs of the era.

The design started as a collaborative project between Germany and France in the 1950s, but the partnership ended and the final design was ordered by the Bundeswehr, production starting in 1965. In total 6,485 Leopard tanks have been built, of which 4,744 were battle tanks and 1741 were utility and anti-aircraft variants, not including eighty prototypes and pre-series vehicles.

The Leopard quickly became a standard of European forces, and eventually served as the main battle tank in over a dozen countries worldwide. Since 1990, the Leopard 1 has gradually been relegated to secondary roles in most armies. In the German Army, the Leopard 1 MBTs have been phased out in 2003 while Leopard 1 derived vehicles are still widely used. The Leopard 2 MBTs have taken over the MBT role. Leopard hulls have been re-used in a wide variety of roles.

The leopard ( /ˈlɛpərd/), Panthera pardus, is a member of the Felidae family and the smallest of the four "big cats" in the genus Panthera, the other three being the tiger, lion, and jaguar. The leopard was once distributed across eastern and southern Asia and Africa, from Siberia to South Africa, but its range of distribution has decreased radically because of hunting and loss of habitat. It is now chiefly found in sub-Saharan Africa; there are also fragmented populations in the Indian subcontinent, Sri Lanka, Indochina, Malaysia, Indonesia, and China. Because of its declining range and population, it is listed as a "Near Threatened" species on the IUCN Red List.

Compared to other members of the Felidae family, the leopard has relatively short legs and a long body with a large skull. It is similar in appearance to the jaguar, but is smaller and more slightly built. Its fur is marked with rosettes similar to those of the jaguar, but the leopard's rosettes are smaller and more densely packed, and do not usually have central spots as the jaguars do. Both leopards and jaguars that are melanistic are known as black panthers.