In the crystal structure of the title complex, [Al(CH(3))(2)(C(17)H(30)N(3))], the Al(III) cation is coordinated by two methyl ligands and two N atoms from the guanidinato ligand in a distorted tetra-hedral geometry. The dihedral angle between the CN(2) and AlC(2) planes is 85.37 (2)°. The two N atoms of the guanidinato ligand exhibit an almost uniform affinity to the metal atom.