Oats are vegan, but that doesn’t necessarily mean that all oatmeal is vegan. u003cbr/u003eu003cbr/u003eMost oatmeal consists of oats and milk derived from cows, which isn’t vegan. u003cbr/u003eu003cbr/u003eHowever, this can be easily substituted with a plant-based alternative, such as almond or oat milk, which would make the oatmeal vegan.