No, Ghost is not a goth band, because they play Hard/Pop Rock/Heavy Metal, 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 Ghost are Astrovamps, Fields Of The Nephilim, and Love Like Blood.