There is a different recipe for every single form of cookie, which explains some cookies contain dairy ingredients while others do not. This is to say, many cookies from Girl Scouts are not vegan, but some of these are. These vegan options are Thin Mints, the non-sandwiched type S’mores, Lemonades, Thanks-A-Lot, and Peanut Butter Patties.
 
It is worth noting that because Girl Scouts obtain cookies from separate suppliers, you should focus on the specific maker to get the vegan products. Also note that products similar to the last four cookies mentioned above come from separate makers, and these are not vegan. Those non-vegan cookies have names and flavors similar to the four options mentioned earlier. Only Thin Mints are vegan no matter who produced these. Maybe that is why Thin Mints is among the best-known Girl Scouts cookies out there.