C4H6

The molecular formula C4H6 (molar mass: 54.09 g/mol) may refer to:

• Bicyclobutane
• 1,3-Butadiene
• 1,2-Butadiene
• 1-Butyne
• Cyclobutene
• Dimethylacetylene (2-butyne)
• 1-Methylcyclopropene
• 3-Methylcyclopropene
• Methylenecyclopropane
• Trimethylenemethane