Abstract: A temperature-indicating disposable lid (14) for beverage containers (20) provides users of disposable beverage containers with a reliable method of determining if, before they drink it, a beverage is too hot in temperature to safely and comfortably imbibe. The inventive device includes the following: (1) a flexible disc-like body; (2) a slot opening at the periphery; (3) a non-permeable tapered cylindrical protrusion (NPTCP), at the distal end of which there is a . . . (4) temperature indicating tab, on which is a chemical or substance that is formulated to change color when a liquid that comes into close approximation with it reaches a particular temperature.