Methylene may refer to:

• Methylene group or methylene bridge (CH2 or equivalently −CH2−), a part of a molecule connected to the rest of the molecule by two single bonds.

• An older name for methylidene group (=CH2), a part of a molecule connected to another atom by a double bond.

• Methylene (compound) (CH2), 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

de:Methylengruppe sv:Metylengrupp