Dibromoacetylene is a molecular chemical compound containing acetylene, with its hydrogen substituted by bromine.

[2] Dibromoacetylene can be polymerised to polydibromoacetylene using catalysts like titanium tetrachloride and triethylaluminium.

Polydibromoacetylene is black, electrically conducting, and stable in air to over 200 °C.

[2] In air dibromoacetylene spontaneously inflames producing black sooty smoke and a red flame.

[5] Dibromoacetylene reacts with Apiezon L, which is used as a vacuum grease in distillation, so its use is unsuitable with this chemical.