Hercules immediately preceded Mulan as Disney’s 35th animated feature.
Disney’s 1998 Mulan was promoted as the studio’s 36th animated feature, placing it directly after Hercules in the numbered sequence of Walt Disney Animation Studios releases. Hercules premiered in 1997 and adapted characters and stories from Greek mythology.
The numbering refers to Disney’s official animated-feature canon, not every animated project produced or distributed by the company. That distinction matters because Disney released shorts, television projects, package films, and other animation outside the main feature sequence.
Mulan was followed by Tarzan in 1999, which became the 37th film in the canon. The sequence is therefore Hercules, Mulan, and Tarzan—not Hercules, The Hunchback of Notre Dame, and Mulan, even though several of those films belong to the same broad era of Disney animation.