There is only one Disneyland Park (the original), and it is significantly older than its neighbor. Disneyland Park in California opened on July 17, 1955, and was the only theme park designed and built under the direct supervision of Walt Disney himself. Its counterpart in California, Disney California Adventure (DCA), is much younger, having opened nearly 46 years later on February 8, 2001. If you are looking at the global "Disney" context, the next oldest park is Magic Kingdom at Walt Disney World in Florida, which opened in 1971. The original 1955 Disneyland is considered the "blueprint" for all modern theme parks; its lands like Fantasyland and Tomorrowland set the standard for immersive storytelling. While DCA has undergone massive renovations (like the addition of Cars Land and Avengers Campus) to keep it modern, the "original" Disneyland Park remains the historic heart of the resort and is the most visited park for those seeking that classic, mid-century Disney nostalgia.
The older of the two original Disneyland parks is Disneyland Park in Anaheim, California, which opened on July 17, 1955.
The second Disneyland park, Disneyland Paris (originally called Euro Disney Resort), opened much later on April 12, 1992.
So, Disneyland California is the oldest Disneyland park in the world. ?✨