Yes, plant proteins are typically lactose-free.
Lactose is a sugar found in milk and dairy products, and since plant-based proteins come from sources such as legumes (e.g., beans, lentils), grains (e.g., quinoa, rice), nuts (e.g., almonds, peanuts), seeds (e.g., chia seeds, hemp seeds), and vegetables, they do not contain lactose.
This makes plant-based proteins a suitable alternative for individuals who are lactose intolerant or have a dairy allergy. Plant-based protein sources are also commonly used by vegans and vegetarians as a primary source of protein in their diets.