Neverwinter Nights 2 (also known as NWN2) is a computer role-playing game developed by Obsidian Entertainment and published by Atari. It is the sequel to BioWare`s Neverwinter Nights, based on the Dungeons & Dragons pencil and paper fantasy role-playing game. Neverwinter Nights 2 utilizes an adaptation of the Dungeons & Dragons 3.5 edition rules. Players create player characters to represent them during the game, using the same character creation rules as found in the Dungeons & Dragons game. They may gain the assistance of up to three 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 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.

Neverwinter Nights 2 went into development in July, 2004. This sequel was designed with the Aurora Engine, also used by its predecessor, and the game`s toolset was included in the game`s release for players to use in designing their own adventures. The game`s design team drew upon older computer role-playing games, and decided that the player character would have to earn the respect of others by the things the character does. The game was also designed to be playable with other players online, if they play together from the beginning of the storyline. The game was released in October and November 2006.

Reviews of Neverwinter Nights 2 were generally positive. Reviewers were pleased with the changes that had been made from the first game in the series, especially regarding the storyline and party management. The game won GameSpot`s Best Story award for 2006. One of the most commonly raised complaints about the game was the presence of numerous technical glitches in its initial release. Several official expansions have been released for the game in 2007 and 2008.

Neverwinter Nights 2 is a role-playing game based on the Dungeons & Dragons 3.5 edition ruleset. Before the game begins, players build a player character in accordance with the character creation rules of Dungeons & Dragons, which includes selecting a race and class, then assigning skill points. There are 12 classes available, including the rogue and the wizard. Neverwinter Nights 2 makes use of the d20 system seen in Dungeons & Dragons, where a "die roll" or random number is used to determine the probability and effectiveness of every action, including attacks and saving throws. The player character may gain the assistance of up to three party members, who can be controlled directly by the player or given orders dictating how to behave in combat.

The campaign of Neverwinter Nights 2 can be played with other players online, but only from the beginning of the storyline. Various modifications can be made to the rules for multiplayer games, such as deactivating friendly fire. A BioWare community account is required to play online, and players are able to search for game servers matching their style of play. Players can upload and play modules online created with the Electron toolset, which is included with the Windows version of the game.