The LEGO Harry Potter theme has a history marked by initial success, a temporary hiatus, and a triumphant return driven by continued fan demand. The first sets were launched in 2001 to coincide with the release of the movie Harry Potter and the Sorcerer's Stone. This initial run, which included a modular Hogwarts Castle system, continued for several years, following the release of subsequent films. For a brief period in the mid-2000s, sales tapered off, and the line was eventually discontinued after 2007. However, the release of the popular LEGO Harry Potter video games in 2010 and 2011 reignited interest in the brand, leading to a small revival wave of new and remade sets that ultimately ended after 2012.

The theme’s most significant revival began in 2018, coinciding with the broader resurgence of the Wizarding World franchise. This new era of LEGO Harry Potter featured far more detailed and complex sets, including massive display models designed to appeal to both children and adult collectors. The new releases brought back the modular Hogwarts concept, allowing builders to connect sets to create an ever-expanding, grander version of the castle. The relaunch also expanded to include sets inspired by the Fantastic Beasts movies and featured a new collection of highly detailed minifigures.

Since 2018, the LEGO Harry Potter line has continued to grow and innovate, with a steady stream of new products each year. For the 20th anniversary of the theme in 2021, LEGO released a series of commemorative sets that included special golden minifigures. The company has also expanded its offerings to include different product types, such as the micro-scale Hogwarts Castle and Grounds and the large-scale, detailed Hogwarts Icons - Collectors' Edition. This ongoing commitment to new, intricate, and often large-scale designs ensures the LEGO Harry Potter theme remains a thriving and beloved part of the LEGO family.