Methylene may refer to:
- Methylene group or methylene bridge (CH<sub>2</sub>< or equivalently −CH<sub>2</sub>−), a part of a molecule connected to the rest of the molecule by two single bonds.
- An older name for methylidene group (=CH<sub>2</sub>), a part of a molecule connected to another atom by a double bond.
- Methylene (compound) (CH<sub>2</sub>), an organic compound.
See also
- Bichloride of methylene (30% methanol and 70% chloroform), a variant of the old anesthetic A.C.E. mixture
- Methyl group
- Methylenedioxy
- Mytilene, a city in Greece
- Methanol
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