Thorium dicarbide is an inorganic compound with the chemical formula ThC2.

[2] It ignites at 2773 °C and becomes superconducting at 9 K.[3] At room temperature it has a monoclinic crystal structure with the space group C2/c (space group no.

At temperatures between 1430 °C and 1480 °C it exists in a tetragonal phase and above that in a cubic crystal structure.

[4] Thorium dicarbide can be rapidly hydrolyzed in the air to generate thorium dioxide, hydrogen and hydrocarbons.

[5] Its reaction rate is 10 times that of the corresponding uranium dicarbide.