Legoland Discovery Center Boston, Indoor theme park in Somerville, United States.

LEGO Discovery Center Boston is an indoor family entertainment center at Assembly Row in Somerville, Massachusetts, owned and operated by Merlin Entertainments. Its attractions include the LEGO Factory Tour showing how bricks are made, a 4D cinema, the Kingdom Quest Laser Ride with toy guns fired from moving vehicles, Merlin's Apprentice Ride pedalled by visitors, LEGO City: Play Zone with climbing walls and slides, and Miniland, whose LEGO models reproduce Fenway Park and Gillette Stadium.

Legoland Discovery Center Boston opened in 2014 at Assembly Row in Somerville, the first Legoland Discovery Center in the United States; the first anywhere opened in Berlin in 2007. The center is owned and operated by Merlin Entertainments. A $12 million renovation began to rebrand it as LEGO Discovery Center, with completion planned for spring 2023.

The Master Builder Academy let visitors meet the center's Master Model Builders, who showed how LEGO models are designed and built. A LEGO Friends area, Olivia's House, held karaoke and other activities, and a DUPLO Farm offered soft play bricks for younger children.

Advance reservations are strongly recommended, especially during busy periods, as entry happens in scheduled time slots. This approach keeps visitor numbers comfortable throughout the facility.

Miniland at this Legoland Discovery Center held LEGO scale models of Boston and other Massachusetts landmarks, including Gillette Stadium and Fenway Park. The attraction closed for a $12 million renovation due to finish in spring 2023, when it was to be rebranded LEGO Discovery Center; the attached shop stayed open throughout.