<p><b>丁二醇</b>（<span lang="en"><i>Butanediol</i></span>，亦有簡寫作<b>BDO</b>）是一種有4個碳原子的二醇類，有以下四種：
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<ul><li>1,2-丁二醇 (1,2-Butanediol)</li>
<li>1,3-丁二醇 (1,3-Butanediol)</li>
<li>1,4-丁二醇 (1,4-Butanediol)</li>
<li>2,3-丁二醇 (2,3-Butanediol)</li></ul><p>理論上，<b>1,1-丁二醇</b>及<b>2,2-丁二醇</b>亦有可能出現，但實際上這類化合物很不穩定，會很快脫水成為丁醛及丁酮。
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**丁二醇**（_Butanediol_，亦有簡寫作 **BDO**）是一種有 4 個碳原子的二醇類，有以下四種：

* 1,2 - 丁二醇 (1,2-Butanediol)
* 1,3 - 丁二醇 (1,3-Butanediol)
* 1,4 - 丁二醇 (1,4-Butanediol)
* 2,3 - 丁二醇 (2,3-Butanediol)

理論上，**1,1 - 丁二醇**及 **2,2 - 丁二醇**亦有可能出現，但實際上這類化合物很不穩定，會很快脫水成為丁醛及丁酮。

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1,5-丁二醇