Into the Electric Castle – A Space Opera is the third album of the progressive metal project Ayreon by Dutch songwriter, producer, singer, and multi-instrumentalist Arjen Anthony Lucassen. Released in 1998, it was the band's first double album.

Progressive metal is a broad fusion music genre melding heavy metal and progressive rock, combining the loud "aggression" and amplified guitar-driven sound of the former with the more experimental, cerebral or quasi-classical compositions of the latter.