Mortal Engines is a young-adult science fiction novel by Philip Reeve, published by Scholastic UK in 2001. The book focuses on a futuristic, steampunk version of London, now a giant machine striving to survive on a world that is running out of resources.

The Mortal Engines Quartet, also known as the Predator Cities Quartet, is a series of epic young adult science fiction novels by the British novelist and illustrator Philip Reeve. He began the first volume of the series, Mortal Engines, in the 1980s, and it was published in 2001. Reeve then published three further novels, Predator's Gold (2003), Infernal Devices (2005), and A Darkling Plain (2006).