No, Panic! At The Disco is not a goth band, because they play Pop Rock, while goth music consists of Gothic Rock and its derived genres, like Deathrock, Darkwave, Ethereal Wave, and Coldwave.

If you want to dive into the goth music scene, some of the bands that might appeal to you if you enjoy Panic! At The Disco are Cocteau Twins, The Cure, and Vision Video.