角鼻龙类（Ceratosauria）是一群兽脚亚目恐龙，被定义为：在兽脚亚目之中，与角鼻龙拥有最近共同祖先，而非与鸟类拥有最近共同祖先的所有物种。目前对于角鼻龙类的鉴别特征、物种列表，并没有一致的共识。根据其中一个理论，角鼻龙下目包含角鼻龙、轻巧龙、阿贝力龙等生存于晚侏罗纪到晚白垩纪的兽脚亚目恐龙，主要发现于南半球。角鼻龙类的分布广泛，而且是恐龙时代早期的主要掠食性恐龙，然而当坚尾龙类出现时，牠们逐渐在北方各大陆消失。

传统上，角鼻龙类不仅包含以上恐龙，还加上了生存于晚三叠纪到早侏㑩纪的腔骨龙超科（腔骨龙、双脊龙）；这使得腔骨龙超科成为角鼻龙类的较早期分支。然而，最近的研究显示腔骨龙超科并非角鼻龙下目的一个演化支，应该独立于角鼻龙类。该研究也发现，角鼻龙类是坚尾龙类的姊妹分类单元。

Ceratosaurs are members of a group of theropod dinosaurs defined as all theropods sharing a more recent common ancestry with Ceratosaurus than with birds. There is no agreed upon listing of species or diagnostic characters of Ceratosauria, though they were less derived anatomically than the more diverse Tetanurae. According to the latest and most accepted theory, Ceratosauria includes the Late Jurassic to Late Cretaceous theropods Ceratosaurus, Elaphrosaurus, and Abelisaurus, found primarily (though not exclusively) in the Southern Hemisphere. Originally, Ceratosauria included the above dinosaurs plus the Late Triassic to Early Jurassic Coelophysoidea and Dilophosauridae, implying a much earlier divergence of ceratosaurs from other theropods. However, most recent studies have shown that coelophysoids and dilophosaurids do not form a natural group with other ceratosaurs, and are excluded from this group.