Most are, but be sure to check the ingredients just in case. Occasionally you will find things such as lard, butter, margarine or whey powder. And sometimes you will find animal-derived enzymes, glycerin, monoglycerides and diglycerides. This is more likely in wheat-based tortillas than corn-based ones. Corn tortillas and better quality brands of flour tortillas tend to be more consistently vegan friendly. Cheaper flour tortillas, like cheap bread, often use unnecessary ingredients as fillers or preservatives. Despite this I've never had a problem finding vegan brands in any grocery store so I'm sure you won't have any problems either.