Thiophosgene is widely used as a key reagent in organic synthesis, particularly for the introduction of the thiocarbonyl group. It serves as a vital building block in the preparation of various sulfur-containing compounds, including isothiocyanates, thioureas, thioamides, and heterocyclic compounds like thiazoles and dithiocarbamates. These derivatives find applications in pharmaceuticals, agrochemicals, and dyes.

In medicinal chemistry, thiophosgene enables the synthesis of bioactive molecules and drug intermediates due to its ability to form stable carbon-sulfur bonds. It is also employed in the production of specialty polymers and pesticides, where the thiocarbonyl functionality enhances chemical stability and biological activity.

Due to its high reactivity and toxicity, its use is typically confined to controlled environments in industrial and research laboratories. Safe handling practices are essential to mitigate risks associated with its volatile and hazardous nature.