No, whey protein powder is not vegan. It is a byproduct of cheese production and is made from the liquid that is separated from the curds during the cheese-making process. As such, it contains animal products and is not suitable for vegans or those following a strictly plant-based diet. There are alternative protein powder options available, such as pea protein powder, rice protein powder, or hemp protein powder, which are suitable for vegans and those following a plant-based diet.