In Search of Sanity is the third studio album by English thrash metal band Onslaught, released in 1989. With several changes in the band's line up, including the addition of Grim Reaper vocalist Steve Grimmett, the album contains a more polished sound than previous Onslaught albums, meeting mixed views by their fans. It is Onslaught's last album before they disbanded in 1991 and the release of their fourth album, Killing Peace, in 2007.