A heel stabilizer for use with human footwear that reduces or eliminates upward movement of the heel within footwear is disclosed herein. The heel stabilizer preferably includes two gripping portions or parts that grip the heel on the medial and lateral surfaces of the foot, preferably above the widest part of the heel. The heel stabilizer may be integrated directly into footwear. Alternatively, the heel stabilizer may be a separate insert that can be inserted into footwear.