伤齿龙科（Troodontidae）是群类似鸟类的兽脚亚目恐龙。在过去数十年，伤齿龙科的化石很少发现而且零碎，因为牠们曾多次被分类于虚骨龙类的几乎每个主要演化支里。

最近发现了大量的伤齿龙科化石，以及许多新物种。这些新发现包含数个完整且呈天然状态的标本，以及保存羽毛的标本、蛋巢、包含胚胎的蛋、以及完整的未成年体。

关于伤齿龙科生理结构的研究，尤其是最原始的物种如中国猎龙，证实牠们与始祖鸟、原始的驰龙科恐龙有极相似的生理结构，并证实了这些动物都是近亲，共同形成近鸟类演化支。

Troodontidae is a group of bird-like theropod dinosaurs. During most of the 20th century, troodontid fossils were few and scrappy and they have therefore been allied, at various times, with many dinosaurian lineages. More recent fossil discoveries of complete and articulated specimens (including specimens which preserve feathers, eggs and embryos, and complete juveniles), have helped to increase understanding about this group. Anatomical studies, particularly studies of the most primitive troodontids, like Sinovenator, demonstrate striking anatomical similarities with Archaeopteryx and primitive dromaeosaurids, and demonstrate that they are relatives comprising a clade called Paraves.