Tetra-tert-butylethylene is a hypothetical organic compound, a hydrocarbon with formula C18H36, or ((H3C−)3C−)2C=C(−C(−CH3)3)2.

As the name indicates, its molecular structure can be viewed as an ethylene molecule H2C=CH2 with the four hydrogens replaced by tert-butyl −C(−CH3)3 groups.

It is of interest in chemical research as an alkene whose double bond is strained but protected by steric hindrance.

Theoretical studies indicate that the molecule should be stable, with a strain energy of about 93 kcal/mol (390 kJ/mol).

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