A sacrum support pillow comprises a three-sided deformable member having a length and a width. The length defines a central region disposed between first and second ends. The width in the central region is greater than the width in the first and second ends such that the width tapers to points near the first and second ends. The three sided deformable member defines three edges, and wherein a deformable member surface is located between the first and second edges, the second and third edges, and the third and first edges, and wherein each surface is concave and may have a different width. An outer covering encloses the three sided deformable member.