Gluten-Free Confidence Score: 9/10
Kraft (the company that makes Velveeta) has a trusted policy to disclose any allergens on their nutrition label and there are no warning that indicate that Velveeta cheese contains any gluten ingredients. Furthermore, the gluten-free and celiac community is in agreement that Velveeta should be considered gluten-free. Since Velveeta is not certified Gluten-Free we cannot give it a perfect 10/10, but unless something changes, you can consider it gluten-free.
[Updated March 2016]