Pentachlorocyclopropane is a chlorinated cyclopropane with the chemical formula C3HCl5.

It is a colourless liquid with a faint minty odour.

[1] It is thermally unstable above 100 °C; decomposition gives 1,1,3,3,3-pentachloropropene by isomerisation.

[3] Pentachlorocyclopropane can be obtained by the addition of dichlorocarbene into trichloroethylene in presence of a base.

[4] Pentachlorocyclopropane itself gives tetrachlorocyclopropene when reacted with a base such as potassium hydroxide by means of dehydrohalogenation.