The quagga (Equus quagga quagga) is an extinct subspecies of the plains zebra that lived in South Africa until the nineteenth century. It was long thought to be a distinct species, but genetic studies have shown it to be the southernmost subspecies of the plains zebra. It is considered particularly close to Burchell's zebra. Its name is derived from its call, which sounds like "kwa-ha-ha".

The quagga is believed to have been around 257 cm (8 ft 5 in) long and 125–135 cm (4 ft 1 in–4 ft 5 in) tall at the shoulder. It was distinguished from other zebras by its limited pattern of primarily brown and white stripes, mainly on the front part of the body. The rear was brown and without stripes, and therefore more horse-like. The distribution of stripes varied considerably between individuals. Little is known about the quagga's behaviour, but it may have gathered into herds of 30–50 individuals. Quaggas were said to be wild and lively, yet were also considered more docile than Burchell's zebra. They were once found in great numbers in the Karoo of Cape Province and the southern part of the Orange Free State in South Africa.