A white elephant is a possession that its owner cannot dispose of without extreme difficulty, and whose cost, particularly that of maintenance, is out of proportion to its usefulness. In modern usage, it is a metaphor used to describe an object, construction project, scheme, business venture, facility, etc. considered expensive but without equivalent utility or value relative to its capital (acquisition) and/or operational (maintenance) costs.

A white elephant is a rare kind of elephant, but not a distinct species. Although often depicted as snow white, their skin is typically a soft reddish-brown, turning a light pink when wet. They have fair eyelashes and toenails. The traditional "white elephant" is commonly misunderstood as being albino, but the Thai term, chang samkhan, actually translates as 'auspicious elephant', being "white" in terms of an aspect of purity.