Diphosphorus tetrafluoride is a gaseous compound of phosphorus and fluorine with formula P2F4.

[1] Diphosphorus tetrafluoride was discovered in 1966 by Max Lustig, John K. Ruff and Charles B. Colburn at the Redstone Research Laboratories.

The initial synthesis reacted phosphorus iododifluoride with mercury at room temperature.

[5] Diphosphorus tetrafluoride reacts with diborane to yield another gas P2F4•BH3 which does not condense above −85°C.

[6] Diphosphorus tetrafluoride reacts with oxygen or water to yield diphosphorus tetrafluoride oxide, which has one oxygen atom inserted between the two phosphorus atoms:[2][7] The latter compound is a gas with boiling point around −18 °C.