No it is not. Unless labeled specifically as such, the majority of commercial brands of potato bread are not actually gluten-free. Potato bread is usually just regular wheat bread–with a portion of the wheat flour that has been replaced with potato flour, potato flakes, or mashed potatoes.
Many gluten-free breads do contain a measure of potato flour or potato starch however.
Nutrition Facts
A single slice of potato bread has about 85 calories. It also contains 1 gram of fat and 14 grams of carbohydrates. 170 milligrams of sodium and 4 grams of protein are in one slice as well.
Health Benefits
Potato bread has no special health benefits to consider in comparison to any other type of bread. There is no considerable difference between traditional potato bread and regular wheat or white breads.
Gluten-Free Alternatives
There are several recipes to be found for potato bread that are gluten free. There are even many of them that use sweet potatoes. Check on recipe collection sites such as yummly.com and allrecipes.com. You can even take any of your own recipes for potato bread and substitute the wheat flour for a blend of rice or soy flours or other gluten-free flour blends.