Neverwinter Nights 2: Storm of Zehir is an expansion pack for the role-playing video game Neverwinter Nights 2, developed by Obsidian Entertainment and published by Atari Interactive. It was released in late 2008 in North America, Europe, and Australia. Like previous entries in the Neverwinter Nights series, Storm of Zehir is based on the paper and pencil fantasy role-playing game Dungeons & Dragons, and uses the game's 3.5 edition ruleset.

Neverwinter Nights 2 is a role-playing video game developed by Obsidian Entertainment and published by Atari Interactive. It is the second installment in the Neverwinter Nights series and is the sequel to BioWare's Neverwinter Nights, based on the Dungeons & Dragons fantasy tabletop role-playing game. Neverwinter Nights 2 utilizes an adaptation of the Dungeons & Dragons 3.5 edition rules. Players create player characters to represent themselves in the game, using the same character creation rules as found in the Dungeons & Dragons game. They may gain the assistance of additional party members, and they eventually acquire a keep that can be used as a base of operations. Neverwinter Nights 2 is set in the Forgotten Realms campaign setting—in and around the city of Neverwinter. The story is mostly unrelated to Neverwinter Nights and follows the journey of an orphaned adventurer investigating a group of mysterious artifacts known as "silver shards" and their connection to an ancient, evil spirit known as the King of Shadows.