However, there are two things that might have you thinking about a fourth movie:
* "High School Musical: The Musical: The Series" is a Disney+ television series that picks up the story of a group of high schoolers putting on a production of "High School Musical" at their school. While not directly a fourth movie, it is considered a continuation of the franchise by many fans.
* "High School Musical 4: The Reunion" is the title of a fan-made film that was released in 2016. It featured several actors from the original trilogy and was released online, but is not an official Disney production.
So, while a "High School Musical 4" movie doesn't exist, there are ways to enjoy more of the franchise!