N-methyltransferase may refer to:
(RS)-1-benzyl-1,2,3,4-tetrahydroisoquinoline N-methyltransferase 3-hydroxy-16-methoxy-2,3-dihydrotabersonine N-methyltransferase Amine N-methyltransferase Anthranilate N-methyltransferase (cytochrome c)-arginine N-methyltransferase (Myelin basic protein)-arginine N-methyltransferase Calmodulin-lysine N-methyltransferase Carnosine N-methyltransferase (S)-coclaurine-N-methyltransferase Dimethylhistidine N-methyltransferase Glycine N-methyltransferase Guanidinoacetate N-methyltransferase Histamine N-methyltransferase Histone methyltransferase (cytochrome c)-lysine N-methyltransferase (Ribulose-bisphosphate carboxylase)-lysine N-methyltransferase Methylamine—glutamate N-methyltransferase Nicotinamide N-methyltransferase Nicotinate N-methyltransferase Phenylethanolamine N-methyltransferase Phosphatidylethanolamine N-methyltransferase Phosphatidyl-N-methylethanolamine N-methyltransferase Phosphoethanolamine N-methyltransferase Protein-histidine N-methyltransferase Putrescine N-methyltransferase Pyridine N-methyltransferase (S)-tetrahydroprotoberberine N-methyltransferase Trimethylsulfonium—tetrahydrofolate N-methyltransferase Tyramine N-methyltransferase
