Infusion is an inverted steel roller coaster at Pleasure Beach Resort, Lancashire, England. It is a 689m standard "Mark 3" model Vekoma Suspended Looping Coaster (SLC) and the first to be suspended entirely over water.

An inverted roller coaster is a type of steel roller coaster in which the train runs under the track with the seats directly attached to the wheel carriage. Riders are seated in open cars, letting their feet swing freely. The inverted coaster was pioneered by Swiss roller coaster manufacturer Bolliger & Mabillard in the early 1990s with the development of Batman: The Ride, which opened at Six Flags Great America on May 9, 1992.