Oat milk is a plant milk derived from whole oat (Avena spp.) grains by extracting the plant material with water. Oat milk has a creamy texture and mild oatmeal-like flavor, and is manufactured in various flavors, such as sweetened, unsweetened, vanilla, and chocolate.
Unlike other plant milks having origins as early as the 13th century, oat milk was developed in the 1990s by the Swedish scientist Rickard Öste, founder of oat milk manufacturer Oatly.
Plant milk is a category of non-dairy beverages made from a water-based plant extract for flavoring and aroma. Nut milk is a subcategory made from nuts, while other plant milks may be created from grains, pseudocereals, legumes, seeds or endosperm. Plant-based milks are consumed as alternatives to dairy milk and provide similar qualities, such as a creamy mouthfeel, as well as a bland or palatable taste. Many are sweetened or flavored (e.g., vanilla).
As of 2021, there were about 17 different types of plant milks, of which almond, oat, soy, coconut and pea are the highest-selling worldwide. Production of plant milks—particularly soy, oat, and pea milks—can offer environmental advantages over animal milks in terms of greenhouse gas emissions and land and water use.