Universal Orlando opened on June 7, 1990 as the theme park Universal Studios Florida. It was opened as a joint venture between Universal Entertainment and The Blackstone Group. The park was in direct competition with Disney MGM Studios (now called Disney's Hollywood Studios).
In 1994, executives started planning the expansion of the resort into a multi-day vacation destination. In late 1995, construction began on a new park, Islands of Adventure. The Islands of Adventure Preview Center opened in May 1997 replacing the Screen Test Home Video Adventure. During this time, several new attractions were being built and opened at Universal Studios Florida, including Woody Woodpecker's KidZone, which opened in 1998, Men in Black: Alien Attack and Animal Actors On Location! (formerly Animal Planet Live).
On May 28, 1999, Universal’s Islands of Adventure opened to the general public. It featured six themed "islands", including the Port of Entry, Seuss Landing, The Lost Continent, Jurassic Park, Toon Lagoon, and Marvel Super Hero Island. The park opened to mediocre attendance, and several attractions were closed shortly thereafter, including Island Skipper Tours, due to lack of attendance.
Along with the new theme park, the resort also opened a Florida version of Universal CityWalk from Universal Studios Hollywood. CityWalk Orlando, but with different venues and design. Universal also opened the resort's first onsite hotel in September 1999. Loews Portofino Bay Hotel (originally Portofino Bay Hotel, a Loews Hotel) was operated and partially owned by Loews Hotels but was also partially owned by Universal and The Blackstone Group. The two theme parks, CityWalk, and the hotel were branded as Universal Studios Escape, however the name was quickly changed to Universal Orlando Resort. In December 2000, Hard Rock Hotel opened as Universal Orlando's second onsite hotel. Despite its name, the hotel is owned by Loews Hotels, like Loews Portofino Bay Hotel and is not affiliated with Hard Rock International. In 2001, Loews Royal Pacific Resort opened. In the midst of all these openings, two parking garages were constructed and the popular water park Wet 'n Wild Orlando was acquired. In 2003, rumors began swirling that a Harry Potter themed attraction would be coming to Universal or one of the Disney parks. On May 31, 2007, Universal, in partnership with Warner Bros., officially announced The Wizarding World of Harry Potter would be added to its Islands of Adventure park. Just over three years later, on June 18, 2010, the seventh "island" at Universal's Islands of Adventure, The Wizarding World of Harry Potter, opened.
Shortly after the massive success of the grand opening of The Wizarding World of Harry Potter - Hogsmeade, rumors began to swirl once again, this time of a second Potter-themed area in Universal Studios Florida. It was announced shortly thereafter that Universal would begin construction of The Wizarding World of Harry Potter -Diagon Alley, replacing Jaws: The Ride. On July 8, 2014, Diagon Alley officially opened to the public.
The Blackstone Group sold its stake in Universal Orlando in early 2011.