Side 3 (2010) is a compilation album by Circulatory System that accompanied their 2009 release Signal Morning.

The limited release 12" album includes remixes, demos and alternate-takes, and came with the deluxe edition of Signal Morning.

The covers for the album were handmade and individually stencil spray-painted with the number 3, on top of the original Signal Morning album cover.

It was released in various colors and variations of layout, designed by Will Cullen Hart.

All tracks were edited and mastered by the recording artist Derek Almstead.