<p><b>17β-羥基類固醇脫氫酶</b>（英語：<span lang="en">17β-hydroxysteroid dehydrogenase</span>，EC 1.1.1.51（頁面存檔備份，存於網際網路檔案館））是一種以NAD<sup>+</sup>或NADP<sup>+</sup>為受體、作用於供體CH-OH基團上的氧化還原酶。這種酶能催化以下酶促反應：
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<dl><dd>睪酮 + NAD(P)<sup>+</sup> <span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \rightleftharpoons }">
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  </semantics></math></span></span> 雄烯二酮 + NAD(P)H + H<sup>+</sup></dd></dl><p>3(或17)β-羥基類固醇脫氫酶也能作用於其他3β-羥基類固醇或17β-羥基類固醇
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**17β- 羥基類固醇脫氫酶**（英語：17β-hydroxysteroid dehydrogenase，EC 1.1.1.51（頁面存檔備份，存於網際網路檔案館））是一種以 NAD+ 或 NADP+ 為受體、作用於供體 CH-OH 基團上的氧化還原酶。這種酶能催化以下酶促反應：

　
: 睪酮 + NAD (P)+ $\rightleftharpoons $ 雄烯二酮 + NAD (P) H + H+

3 (或 17)β- 羥基類固醇脫氫酶也能作用於其他 3β- 羥基類固醇或 17β- 羥基類固醇
17β-羟基类固醇脱氢酶