Glyoxal-bis(mesitylimine) is an organic compound with the formula H2C2(NC6H2Me3)2 (Me = methyl).

It is a yellow solid that is soluble in organic solvents.

It is used in coordination chemistry and homogeneous catalysis.

It is synthesized by condensation of 2,4,6-trimethylaniline and glyoxal.

In addition to its direct use as a ligand, it is a precursor to imidazole precursors to the popular NHC ligand called IMes.