Mare milk is milk lactated by female horses, known as mares, to feed their foals. It is rich in whey protein, polyunsaturated fatty acids and vitamin C, and is a key ingredient in kumis. In several European countries, including Germany, it is sold powdered.

Mare milk is sometimes chosen over cow milk for its purported health benefits. A niche market considers it a remedy for skin or digestive problems. Peer-reviewed papers suggest it can reduce atopic dermatitis or eczema. It is used to make cosmetics and can form cheese with camel rennet, but not bovine.