R-Type III: The Third Lightning is a 1993 horizontally scrolling shooter video game.

R-Type III: The Third Lightning was the first game in the series to introduce new Forces. As well as the original Force (which was now named the Round Force, later named as the Standard Force in R-Type Delta), the player could choose from two other Forces: the Shadow Force and the Cyclone Force. These both had new, different weapon sets and special enhancements.

It also refined the weapons and charging system. It reverted to the original red-blue-yellow weapon system, and the Diffusion Wave Cannon from R-Type II was replaced with a more standard wave cannon. Charging this cannon to full beam strength results in a massive, powerful beam that passes through all enemies and obstacles. A new weapon called the Hyper Wave Cannon was also added to the ship, which the player could use instead of the normal wave cannon if desired. By switching to Hyper mode and supercharging the wave cannon, the ship temporarily gains the ability to use the Hyper Wave Cannon, which is unique among wave cannons in having a rapid fire capability. The shots fired create damaging explosions, and if the player has collected one or two Bits, they spin around the ship burning with energy. However, this Hyper mode causes the ship to overheat after a short while, and it must subsequently spend seconds cooling down, during which time the wave cannon is inoperative.