Lego Island is a Lego-themed open world action-adventure game developed and published by Mindscape. It was released for Windows on September 26, 1997, as the second Lego video game overall and the first one outside Japan. In the "proto-open world" game, players explore the eponymous island as one of five unique minifigure characters, and can build vehicles and complete side quests; the game's main story involves Pepper Roni, a pizza delivery boy, and his efforts to stop an escaped prisoner known as the Brickster from destroying the island.

Lego Island was the first video game developed after the Lego Group began efforts to gain a foothold in the video game industry. The game's main characters are each modeled after an intelligence type according to the theory of multiple intelligences. The development team studied how children engaged with Lego bricks to help shape the game's scope and gameplay.

Lego Island received generally positive reviews from critics. It was a commercial success, selling close to one million copies by 1999. The game was followed by two sequels, both developed by Silicon Dreams Studio: Lego Island 2: The Brickster's Revenge (2001) and Island Xtreme Stunts (2002). It has since gained a cult following, with a fan-made sequel in development as of 2020^[update], and unofficial ports developed through decompilation released in 2025.

Lego Island is a nonlinear video game played from a first-person perspective. The player is able to freely roam around the eponymous Lego Island, interact with non-player characters, build and drive vehicles, or complete several different missions.

The game features five playable characters: police officers Laura and Nick Brick; pizzeria proprietors Mama and Papa Brickolini; and their adopted son Pepper Roni, a pizza delivery boy who serves as the protagonist. Each playable character possesses their own unique abilities and interactions modeled after different intelligence types listed in Howard Gardner's theory of multiple intelligences; the game showcases two additional intelligence types via non-player characters the Infomaniac, the island's founder who serves as a tour guide, and the Brickster, a criminal incarcerated in Lego Island's jail. Each character can perform a different action to customize non-player characters and vegetation on the island, such as changing their colors or giving them different hats. The game also includes numerous Easter eggs spread across the island. The player can also construct a race car, jet ski, dune buggy, or police helicopter with the help of mechanic Bill Ding, which can be customized and used in missions or to explore the island. There are five missions that the player can perform as any of the playable characters: a motor race at the race track; a jet ski race at the beach; a pizza delivery for Brickolini's Pizzeria; a towing job for the Octan gas station; and ambulance driving for the hospital. The player will be awarded a red, blue, or yellow brick per character for each mission depending on how they place in the race or how quickly they complete the mission, which can be viewed on the Score Cube at the Information Center.

While there is no running story or necessary objective to Lego Island, a special mission will occur if the player has built a police helicopter and delivers a pizza to the Jail as Pepper Roni. Using the fumes from the extremely spicy pizza, the Brickster melts the lock to his cell and escapes in the helicopter, stealing the power brick from the top of the Information Center. He then disassembles the helicopter and steals vehicles from the hospital and police station, planning to disassemble everything on the island with a laser gun powered by the stolen power brick. Giving chase on his skateboard, Pepper pursues the Brickster and recovers the pieces of the helicopter. Once it is rebuilt, Pepper uses the helicopter to fire donuts to speed Nick and Laura up and pizzas to slow the Brickster down, allowing him to be captured. The Brickster is thrown back in jail, and the citizens congratulate Pepper and the player. If the Brickster is not caught before he disassembles all the buildings, an alternate ending occurs in which the Brickster gloats about his success as the citizens break down crying, though the Infomaniac reassures the player that they can rebuild the island and the Brickster will be returned to his cell.

Lego Island was developed by Mindscape, a developer of edutainment software based in Novato, California. The head of one of the company's departments was looking for a partner company in the toy industry and, after some research, settled for the Lego Group, the producer of the Lego line of toys. Mindscape subsequently hired Wes Jenkins, who, in turn, brought on Paul Melmed. Jenkins and Melmed drafted a game concept based on the "Town" theme of Lego sets. Both attended the Toy Fair in New York City in February 1995, pitching the concept to the Lego Group.

Around the same time, the Lego Group (as well as other toy manufacturers) were trying to explore or gain a foothold in the video game industry. The only previous Lego-branded video game was Lego Fun to Build, which was released by Sega in December 1995 for the Japanese Sega Pico market. The Lego Group had established the Futura research and development group in Boston, which was looking at possible intersections between Lego products and digital media, including video games and virtual reality experiences. In 1995, the Lego Group employee Tormod Askildsen was tasked with exploring the company's potential venture into the video game market. He hired a handful of people and prepared a report, titled "Elvis", which he presented during a workshop on December 21, 1995. The report stated that the Lego Group's entrance into the video game market was a necessity, rather than an option. Mindscape and the Lego Group jointly announced their collaboration for a Lego-branded personal computer game on January 27, 1996, then targeting to release the game in the fourth quarter of that year. The game was given a budget of US$2 million.