The molecular formula C₄H₆N₂ may refer to:

• Methylpyrazole
  • 1-Methylpyrazole
  • 3-Methylpyrazole
  • Fomepizole (4-methylpyrazole)
• Methylimidazole
  • 1-Methylimidazole
  • 2-Methylimidazole
  • 4-Methylimidazole
• 1,4-Dihydropyrazine