Super Soaker is an American brand of recreational water gun that uses manually-pressurized air to shoot water with greater power, range, and accuracy than conventional squirt pistols. The Super Soaker was invented in 1989, by engineer Lonnie Johnson. The prototype combined PVC pipe, acrylic glass, and an empty plastic soda bottle.

Originally sold by Larami, and now produced by Hasbro under the Nerf brand, Super Soaker has generated more than $1 billion in total sales. The first Super Soaker went on sale in 1990, and was originally called the Power Drencher. Rebranding the name to Super Soaker occurred in 1991, together with a series of TV advertisements that resulted in two million water guns being sold. Super Soakers were popular for many years—so popular, in fact, that the term super soaker is sometimes used generically to refer to any type of toy pressurized water gun.^{[better source needed]}

In 1985, Air Force and NASA engineer Lonnie Johnson conceived of the idea of a pressurized water gun after shooting a powerful stream of water in his bathroom while performing experiments for a new type of refrigeration system. Several months later, he built a prototype in his basement using Plexiglas, PVC pipe, O-ring seals, and a two-liter soda bottle for the reservoir. Johnson originally wanted to produce the toy himself but the costs were too high. He attempted to arrange partnerships with toy companies to bring the product to market, and in 1989, he found success. While at the American International Toy Fair in New York City, he met the vice president of Larami, a toy company, who showed interest in the idea.

Johnson also built an improved prototype and made a successful sales pitch at the Larami headquarters in Philadelphia, Pennsylvania. Refinements made with Larami design director William Raucci and engineering consultant Bruce D'Andrade made its mass production feasible. The first commercial version of the water gun appeared in stores the following year as the Power Drencher. In 1991, it achieved commercial success under its new name, Super Soaker.

In 1992, Larami was sued for patent infringement by Talk to Me Products, who claimed the Super Soaker was a copy of their American Gladiator water gun, which was patented in 1978. However, Talk to Me Products lost their case as their patent referred to a water gun "having a chamber therein". The Super Soaker used a water chamber on top of the gun, which was detachable for filling.

The revenue that Johnson received from the Super Soaker licensing provided enough money for him to create Johnson Research & Development Co., Inc.

In 1995, Hasbro purchased Larami to produce toys under their name. Larami continued making toys and products under the Super Soaker brand up until 2002, when Larami closed permanently. In its place, Hasbro produced Super Soakers in-house. The brand continued to exist as its own separate entity until 2010, when it was merged with the Nerf brand.

In 2022, Hasbro and WowWee partnered to create a new line of Super Soaker products.