There are 5 Katherine Cosmetics coupons that include promo codes and free shipping deals for October 2018 for you to choose from. Our top coupon for today is a 5% Off coupon code. Use a promo code to save on makeup at Katherine Cosmetics. Enhance your beauty with great shades and products. Made without additives and cruelty-free, you can also feel good about the makeup you purchase from Katherine Cosmetics.