Dichloroethene or Dichloroethylene, often abbreviated as DCE, can refer to any one of several isomeric forms of the organochloride with the molecular formula C₂H₂Cl₂:
There are three isomers:

• 1,1-Dichloroethene
• 1,2-Dichloroethene (E and Z)

Dichloroethene or Dichloroethylene, often abbreviated as DCE, can refer to any one of several isomeric forms of the organochloride with the molecular formula C₂H₂Cl₂:
There are three isomers:

• 1,1-Dichloroethene
• 1,2-Dichloroethene (E and Z)