The sesame seeds you often see on top of bread and nutty-tasting sesame oil, used extensively in Asian cuisine, come from pods that grow on a hardy tropical plant, the Sesamum indicum, which is no relation of the Triticeae family of grasses that includes the gluten-containing cereals wheat, barley and rye.
As well as the risk of cross-contamination in the processing of sesame, also take plenty of care with products such as sesame sticks, which are quite likely to be based on wheat flour or may include other traces of gluten-bearing cereals.