Butanol or butyl alcohol can refer to any of the four isomeric alcohols of formula C₄H₉OH:

• n-Butanol, butan-1-ol, 1-butanol, n-butyl alcohol;
• Isobutanol, 2-methylpropan-1-ol, isobutyl alcohol;
• sec-Butanol, butan-2-ol, 2-butanol, sec-butyl alcohol;
• tert-Butanol, 2-methylpropan-2-ol, tert-butyl alcohol.

It can also refer to butanol fuel, a proposed alternative to gasoline.

n-butanol	isobutanol	sec-butanol	tert-butanol

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