The eatery has welcomed Gold & Green Foods' meat substitute, which is made from pulled oats, beans, peas, and is certified by the American Vegetarian Association (AVA).
For the first time, the chain will also have a vegetarian menu highlighted in its Spanish restaurants so customers can clearly see its meatless offerings.
According to Restauracion News, María José Michavila, General Manager of Taco Bell Spain, said: "[At] Taco Bell, we have always been a safe alternative for vegetarians because we can offer all our products in their veggie version, but many people do not know it.
"This new initiative to customize the menu represents Taco Bell's commitment to our consumers."
National Vegetarian Week
Earlier this year, Taco Bell launched limited edition vegan-friendly tacos in three of its London stores for National Vegetarian Week.
The Edgy Veggie Tacos also featured Gold & Green Foods' plant-based meat - and could be veganized by ditching the cheese and sour cream.
"At Taco Bell, we pride ourselves on being a place where every lifestyle can find exactly what they're craving," Jorge Torres, General Manager of Taco Bell Europe, said.
"So, whether you're a vegetarian or a flexitarian, then you'll love our new flavorsome meat-free offering."