A possum (plural form: possums) is any of about 70 small- to medium-sized arboreal marsupial species native to Australia, New Guinea, and Sulawesi (and introduced to New Zealand and China). The name derives from their resemblance to the opossums of the Americas (the name is from Algonquian wapathemwa, not Greek or Latin, so the plural is possums, not possa or possi).

Possums are quadrupedal diprotodont marsupials with long tails. The smallest possum, indeed the smallest diprotodont marsupial, is the Tasmanian pygmy possum, with an adult head-body length of 70 mm (2 ³⁄₄ in) and a weight of 10 g (³⁄₈ oz). The largest are the two species of bear cuscus which may exceed 7 kg (15 lb 7 oz). Possums are typically nocturnal and at least partially arboreal. The various species inhabit most vegetated habitats, and several species have adjusted well to urban settings. Diets range from generalist herbivores or omnivores (the common brushtail possum) to specialist browsers of eucalyptus (greater glider), insectivores (mountain pygmy possum) and nectar-feeders (honey possum).

The Man Who Stepped into Yesterday (often abbreviated as TMWSIY) is a 1987 concept album written by Trey Anastasio, the guitarist and lead vocalist of the American rock band Phish, as his senior thesis while attending Goddard College. Composed in 1987, the thesis included an essay piece and collection of songs (recorded by Phish) relating an epic tale from the band's fictional land of Gamehendge.

Though the album was recorded, it has never been released officially. Phish circulated the studio recording of the suite in 1987 and 1988 and it quickly became a collector's item. At one time Anastasio announced plans in Doniac Schvice, Phish's newsletter, to release the material as an interactive CD-ROM. However, this never happened and the album can only be found in bootleg or in fan-traded form.

On the album, the story of Gamehendge is told in nine parts, with short spoken narration in between. The saga can be compared to fantasy works such as The Chronicles of Narnia or rock concept album projects like The Doors' Celebration of the Lizard or Rush's 2112 suite.

A possum is any of a number of arboreal marsupial species native to Australia, New Guinea, and Sulawesi.

Possum may also refer to:

People with the name