Tantalcarbide is a rare mineral of tantalum carbide with formula TaC.

With a molecular weight of 192.96 g/mol, its primary constituents are tantalum (93.78%) and carbon (6.22%), and has an isometric crystal system.

Tantalum carbide powder is used for many real world applications.

The first documented specimen was discovered in the Nizhnetagilsky District in the Middle Urals, by P. Walther in 1909.

It has an extremely high melting point of around 3800 °C, although actually testing of this has not been documented.

Tantalcarbide is isostructural with niobocarbide, and is coincidentally found in the same localities.