Greyhound racing is the sport of racing greyhounds. The dogs chase a lure (traditionally an artificial 'hare' or 'rabbit') on a track until they arrive at the finish line. The one that arrives first is the winner.

In many countries, greyhound racing is purely amateur and for enjoyment. In other countries (particularly Australia, Ireland, Macau, Mexico, Spain, the UK and the US), greyhound racing is part of the gambling business, similar to although far less profitable than horse racing. There is some popular concern in the aforementioned countries regarding the well-being of the dogs; the effectiveness of industry efforts to address these concerns is a topic of some debate. A greyhound adoption movement has arisen to assist retired racing dogs in finding homes as pets. During the race the greyhounds chase mechanical hares, rabbits or sheep.

In Florida, where 16 tracks survive, the handle, or amount wagered, on racing has dropped from about $620 million to $300 million in 10 years.