No, although Harry Styles doesn't eat meat, he isn't vegan he's in fact a vegetarian according to various sources.

Why is Harry Styles vegan?

Harry said he was inspired by the vegan food that his band made on tour and that his "body definitely feels better for it." Literally taking notes over here.

Is Harrys vegan and cruelty free?

Our products are in fact vegan and cruelty free. We don't use animal ingredients, or test on animals.