C4H6

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

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