A Green Slip is a type of insurance policy that is required to register a motor vehicle in New South Wales, Australia. It is also known as Compulsory Third Party (CTP) insurance and is designed to protect drivers from liability if they injure or cause the death of a person or people in a motor accident. The Green Slip scheme covers the cost of injuries caused by a vehicle to anyone, anywhere in Australia, including the driver, passengers, pedestrians, cyclists, and motorcyclists. The policy pays for their treatment and care, which may be for life, and also for loss of income if they are an earner, and any damages claim they may be entitled to lodge. If a person dies as a result of the accident, close relatives may also be able to claim some expenses.

It is important to note that before a Green Slip expires, a new one must be purchased to be able to register a motor vehicle in NSW. If the renewal is done after the due date, the car must not be driven until it is covered, or the driver could be fined $1,200. For most people, there is a choice of either a 12-month policy or a 6-month policy, and other options are available to fleet owners and motor dealers.

It is worth noting that the term "GreenSlips" is also used in the context of a program in the City of Chicago that allows direct deposit participants to view pay slips and W2 forms securely online. However, this is unrelated to the Green Slip insurance policy in Australia.