In organic chemistry, an aminomethyl group is a monovalent functional group with formula . It can be described as a methyl group substituted by an amino group .
Usually aminomethyl groups feature tertiary amines. Often they are obtained by alkylation with Eschenmoser's salt, a source of [CH<sub>2</sub>=N(CH<sub>3</sub>)<sub>2</sub>]<sup>+</sup>.
A cobalt(III) complex of aminomethyl is known in the form [Co(bipyridine)<sub>2</sub>(CH<sub>2</sub>NH<sub>2</sub>)](ClO<sup>4</sup>)<sub>2</sub>.
Aminomethyl is the first member of a series of 1-aminoalkyl groups of the form .
Aminomethyl is used in the standard (IUPAC) names of some compounds, such as 4-(aminomethyl) benzoic acid.