Worms Armageddon is a 1999 turn-based strategy video game developed and published by Team17 as part of the Worms series. It was originally released for the Microsoft Windows operating system, and was later ported to the PlayStation, Dreamcast, Nintendo 64, and Game Boy Color. In the game, the player controls a team of up to eight earthworms tasked with defeating an opposing team using a wide range of weapons at their disposal. The game takes place on a destructible and customizable two-dimensional board and is characterized by cartoonish graphics and a unique brand of humour.

The third installment in the series, Worms Armageddon was originally developed as an expansion pack to Worms 2 (1997) and initially titled Wormageddon before it was released as a standalone game. 

As a result the game is very similar to Worms 2 but has a new single-player mode and adds a number of pieces of new content as well as being released on a wider variety of platforms. Worms Armageddon was acclaimed by critics, who praised the refined gameplay and stylized graphics, and it has been featured in a number of "greatest games of all time" lists. Worms Armageddon on PC is still updated periodically, most recently in 2020. The game was succeeded by Worms World Party (2001), which added further content without drastic change and which was the last 2D-based Worms game before the series moved to 3D.

In August 2024, a port of the PC version to then-current and last generation consoles, titled Worms Armageddon: Anniversary Edition, was announced for release on 26 September. This version includes a digital museum and the emulated version of the Game Boy Color port as bonus features.