Tellerium (Te) is a chemical element with atomic number 52. There are eight naturally occurring tellerium isotopes, six of them are stable and two are radioactive. The radioactive ones, ¹²⁸Te and ¹³⁰Te, are the most abundant.

Tellerium is mainly used in alloys, for example in stainless steel, but other uses include solar panels in the form av cadmium telluride (CdTe).