The London–Sydney Marathon was a car rally from the United Kingdom to Australia. It was first run in 1968, a second event by the same organizers was run in 1977 and a third in 1993 to commemorate the 25th anniversary of the original. Three further rallies have subsequently been contested in 2000, 2004 and 2014.

Rallying is a wide-ranging form of motorsport with various competitive motoring elements such as speed tests, navigation tests, or the ability to reach waypoints or a destination at a prescribed time or average speed. Rallies may be short in the form of trials at a single venue, or several thousand miles long in an extreme endurance rally.