Coniferyl aldehyde is an organic compound with the formula HO(CH3O)C6H3CH=CHCHO.

It is a derivative of cinnamaldehyde, featuring 4-hydroxy and 3-methoxy substituents.

[1][2] In sweetgum (Liquidambar styraciflua), coniferyl aldehyde is a precursor to sinapaldehyde via hydroxylation mediated by coniferyl aldehyde 5-hydroxylase.

[2] It is found in Senra incana (Hibisceae).

It is a low molecular weight phenol that is susceptible to extraction from cork stoppers into wine.