The Bunyoro rabbit or Uganda grass hare (Poelagus marjorita) is a species of mammal in the family Leporidae. It is the only member of the genus Poelagus. It is a medium-sized (400 to 605 millimetres (15.7 to 23.8 in) long), greyish-brown furred, nocturnal, plant-eating rabbit found in central Africa. Its typical habitat is damp savannah, often with rocky outcrops, but it also appears in forests and in rocky areas alongside rock hyraxes.

First described by British mammalogist Jane St. Leger in 1929 as a member of the hares, the Bunyoro rabbit was placed within its own genus in 1932 after specimens were examined in detail with relation to other leporids. Two subspecies from what is now South Sudan were described in the following decades, but neither is recognized today. The Bunyoro rabbit's genetic relationships have been variously described; most place it as closely related to the red rock hares (Pronolagus) and the striped rabbits (Nesolagus), but at least one study describes it as a sister group of the riverine rabbit (Bunolagus). While the Bunyoro rabbit was once considered abundant, and it is classified by the International Union for Conservation of Nature (IUCN) as a least-concern species, sightings have been infrequent, and its distribution is much more limited than early estimations.

The Bunyoro rabbit was first properly described in 1929 as Lepus marjorita or the "grass hare" by Jane St. Leger, a British mammalogist who worked with Oldfield Thomas. Four years earlier, it was misidentified by Geoffrey Douglas Hale Carpenter, who discovered a colony of the species and assumed them to be the feral descendants of European rabbits introduced to the region by Emin Pasha. The original description of the rabbit was from a specimen that was part of a collection of mammals sent to the British Museum from the Protectorate of Uganda by Charles Pitman, the game warden. The type locality of the original specimen is "Near Masindi, Bunyoro, Uganda" at an elevation of 4,000 feet (1,200 m). This species was described as "common on the roads at night", "strongly resembl[ing] the Indian Caprolagus", and of "unusually crisp fur" and "short ears". After receiving and reviewing additional specimens, and noting the species' skeletal characteristics, which resembled those of species in multiple genera—Lepus, Oryctolagus, Sylvilagus, and Pronolagus—St. Leger described the Bunyoro rabbit as belonging to a new monotypic genus, Poëlagus, in 1932. The name was later corrected to Poelagus, removing the diaeresis. Of the known leporids of Africa, Poelagus has been the most recent described.

The Bunyoro rabbit is named after its type locality, part of the Bunyoro kingdom. The common name "Uganda grass hare" references Cenchrus purpureus, a native species of plant known as Uganda grass, among other names. The generic name, Poelagus, references the epithet "grass hare", using the Greek póa (πόα), "grass", and lagós (λαγός), "hare". The specific name, marjorita, is named for Marjorie Pitman, Charles Pitman's wife.

There were two proposed subspecies of Poelagus marjorita, but neither is recognized and both are treated as synonyms of the species. Both of the proposed subspecies were described from what is now South Sudan, and displayed small differences in fur colour and skull morphology.

The Bunyoro rabbit's closest phylogenetic relations appear to be with the red rock hares (Pronolagus). Poelagus and Pronolagus were once thought to be congeneric, but are now considered part of a clade with Nesolagus. These genera likely arose from an ancestral leporid arriving from Asia and spreading to various parts of Africa during the middle Miocene, with a specific vicariance event that separated Nesolagus from the other African leporids occurring 11.3 ± 1.53 million years ago. However, a 2022 study of the phylogenetic relationships between mammals using ultraconserved elements in museum specimens found only distant relationships between Poelagus, Pronolagus and Nesolagus, and placed the riverine rabbit (Bunolagus) as the Bunyoro rabbit's sister clade. No fossils of Poelagus are known.

The phylogenetic relationships between the African leporids are described by the following cladogram, derived from work by Matthee et al., 2004. These relationships are supported by later analysis by Iraçabal et al., 2024:

Poelagus marjorita has a head and body length of about 400 to 605 millimetres (15.7 to 23.8 in) and a weight of 2.26 to 3.17 kilograms (5.0 to 7.0 lb). Both the hind legs and ears are shorter than in other African species, and the coat is coarser. The general body colour is greyish-brown and the tail is yellowish above and white beneath. From the chest to the lower abdomen, a white stripe is visible that widens as it progresses downwards towards the hind limbs. Fur under the body, chin and throat is white, the soles of the feet are covered in whitish to grey fur, and the ear colour is similar to that of the rabbit's back. Rufous fur can be seen on the nuchal patch between the ears down to the base of the neck. The tail size ranges from 38 to 70 millimetres (1.5 to 2.8 in), the hind foot from 65 to 108 millimetres (2.6 to 4.3 in), and the ears from 61 to 70 millimetres (2.4 to 2.8 in).