棘龙科（Spinosauridae）是群独特的兽脚亚目恐龙。是一群群兽脚类恐龙，比较有名的棘龙生活在下阿尔布到白垩纪森诺曼阶段，约112至97万年前。牠们是群相当大型的二足掠食动物，拥有修长、类似鳄鱼的头颅，上有圆锥状的牙齿，这些牙齿有非常小的锯齿状边缘，或者没有锯齿状边缘。齿骨的前部牙齿往外突出，成为这群动物的外表特征。棘龙科的名称来自于棘龙的背部帆状物，由多条神经棘构成。这些帆状物的功能仍在争论中，但普遍的解释是做为调节体温使用、用来威吓可能的攻击者、或是视觉辨识物。有些古生物学家更提出，这些神经棘支撑者由肌肉、脂肪构成的隆肉。

Spinosauridae is a family of specialised theropod dinosaurs. Members of this family were large predators with elongated, crocodile-like skulls, sporting conical teeth with no or only very tiny serrations. The front dentary teeth fanned out, giving the animal a characteristic look. The name of this family alludes to the typically conspicuous sail-like structure protruding from the back of species in the type genus, Spinosaurus. The purpose of the sail is disputed; while popular explanations are that it may have served as a thermoregulator, a threat display, or as a sexual display during courtship, some palaeontologists rather interpret the neural spine elongation in Spinosaurus as a support of a muscular/fatty hump.