Abstract: A stirrup stay for adjusting the horizontal angle of a horse saddle stirrup is constructed from a strip of sheet material that is adapted to be received in the space between the inner and outer portions of a stirrup strap and resting in the loop at the bottom of the strap. The strip of sheet material is hand-deformable by twisting to selectively impart the desired degree of twist to the stirrup strap. The strip may be formed from sheet metal having a cushioning coating protecting a majority of the edges. In one embodiment, a sheet metal strip is bent by 180 degrees near its center to bring opposite longitudinal ends together, and the opposite halves of the strip are covered by a sheath of leather, rubber, or other yieldable material. A central portion of the strip near the bend may remain uncovered and is protected, in use, by placement of the stirrup with its pivot pin resting in the bend.