Odometer fraud, also referred to as "busting miles" (United States) or "clocking" (UK, Ireland and Canada), is the illegal practice of rolling back odometers to make it appear that vehicles have lower mileage than they actually do. Odometer fraud occurs when the seller of a vehicle falsely represents the actual mileage of a vehicle to the buyer.

According to the Office of Odometer Fraud Investigation at the US Department of Transportation, odometer fraud is a serious crime and important consumer fraud issue. In the National Highway Traffic Safety Administration's (NHTSA) 2002 odometer fraud study, the NHTSA determined that 450,000 vehicles were sold each year with false odometer readings, resulting in a cost of over $1 billion annually to car buyers in the US. In the UK, the Office of Fair Trading estimates the annual cost at £500m.