No, Unto Others is not a goth band, because they play Heavy/Gothic Metal, while goth music consists of Gothic Rock and its derived genres, like Deathrock, Darkwave, Ethereal Wave, and Coldwave.

However, they do have a significant goth influence and even have some goth songs in their repertoire, like "Angel of The Night" and "Never, Neverland".

If you want to dive into the goth music scene, some of the bands that might appeal to you if you enjoy Unto Others are Fields Of The Nephilim, The Cure, and The Mission.