Tetrazene is a chemical compound with the molecular formula H2NN=NNH2.

[2] The most stable of these is the straight-chain 2-tetrazene (H2N-N=N-NH2), having a standard heat of formation at 301.3 kJ/mol.

The eleven isomers can be arranged into three groups: straight-chain tetrazenes, four-membered cyclotetrazane, and three-membered cyclotriazanes.

The ionic compound ammonium azide is also a constitutional isomer of tetrazene.

A variety of coordination complexes are known for R2N42- (R = methyl, benzyl).