In general, balsamic glaze is gluten-free. The main ingredients in balsamic glaze are balsamic vinegar and sugar, both of which are naturally gluten-free. However, it's important to check the specific brand or product you're using, as some manufacturers may add additional ingredients or use processes that could introduce gluten. If you have strict dietary restrictions, it may be safer to make your own balsamic glaze using gluten-free balsamic vinegar and gluten-free sweeteners.