Methallyl chloride is the organic compound with the formula CH2=C(CH3)CH2Cl.

It is a colorless liquid and a lacrymator.

Its properties are similar to those of allyl chloride.

It is a strong alkylating agent used to install isobutenyl groups.

Methylenecyclopropane can be synthesised via an intramolecular cyclisation reaction from methallyl chloride by treatment with a strong base such as sodium amide.