大鼻龙属（学名：Captorhinus）又名狭鼻龙，是种史前爬行动物，属于大鼻龙科，生存于二叠纪，化石发现于北美洲。大鼻龙的体型小，身长估计约40公分。

大鼻龙的属名是由拉丁文的捕捉者（captio）与古希腊文的鼻子（rhino）所组成。爱德华·德林克·科普（Edward Drinker Cope）在命名这动物时，认为这动物会用弯曲的前上颌骨捕抓猎物。

一个未成年的标本，曾被创建为Bayloria属，被归类于盘龙目的始蜥科。

大鼻龙的化石，出土于美国奥克拉荷马州的下二叠纪地层（2.99亿到2.7亿年前）

Captorhinus is an extinct genus of captorhinid reptiles that lived during the Permian period. Its remains are known from North America, Europe, India and Africa. In 1882, Edward Cope described a fragmentary skull from the Lower Permian of Texas collected by W. F. Cummins at Coffee Creek as Ectocynodon aguti. The name had then been revised several times by different paleontologists as more genera were discovered. In 1911, paleontologist Ermine Cowles Case revised the recently discovered species. He decided to refer P. (Ectodynodon) aguti, P. aduncus, and P. isolomus to Captorhinus, and established a new family, Captorhinidae.