Unarmed – Best of 25th Anniversary is the sixth compilation album by German power metal band Helloween.

It is a compilation in celebration of the band's 25th anniversary, which contains re-recorded versions of Helloween songs in an acoustic/symphonic style.

Commenting on the album on 2011, the bass guitarist Markus Grosskopf said:[5] It's just like we've been asked what to do [regarding their 25th anniversary], if we're going to do fine remakes or re-masters, but then sell the old stuff people get at home anyway just a slightly different sound, it wouldn't make any sense to us so we just wanted to give people something new.

It was nice to sing this shit and actually show myself that I'm capable of doing that, not hiding behind the metal music but being the main instrument with the voice and front of everybody else.

I don't like the idea of being a metal band and then put out acoustic versions of your music.