板龙类（Plateosauria）是蜥脚形亚目的一个演化支，生存于晚三叠纪到晚白垩纪。板龙类是由Gustav Tornie在1913年提出 。在80年代以前，板龙类这名词很少使用，直到新一代的古生物学家开始重新使用它。

在1998年，保罗.塞里诺（Paul Sereno）将板龙类定义为：恩氏板龙、刀背大椎龙的最近共同祖先、以及其最近共同祖先的所有后代。在2004年，彼得·加尔东（Peter M. Galton）与保罗·阿普彻奇（Paul Upchurch）使用不同定义：恩氏板龙、新洼金山龙的最近共同祖先，与其最近共同祖先的所有后代。根据这个分类法，板龙类包含板龙科以及著名的板龙，并属于原蜥脚下目。加尔东与阿普彻奇另外列入了科罗拉多斯龙、优肢龙、禄丰龙、金山龙、大椎龙、鼠龙、鞍龙、以及云南龙。有些古生物学家认为大椎龙与其近亲属于另一独立的科，大椎龙科。

Plateosauria is a clade of sauropodomorph dinosaurs which lived during the Late Triassic to the Late Cretaceous. The name Plateosauria was first coined by Gustav Tornier in 1913. The name afterwards fell out of use until the 1980s.

Plateosauria is a node-based taxon. In 1998, Paul Sereno defined Plateosauria as the last common ancestor of Plateosaurus engelhardti and Massospondylus carinatus, and its descendants. Peter Galton and Paul Upchurch in 2004 used a different definition: the last common ancestor of Plateosaurus engelhardti and Jingshanosaurus xinwaensis, and its descendants. In their cladistic analysis the Plateosauria belonged to the Prosauropoda, and included the Plateosauridae subgroup. In Galton's and Upchurch's study also Coloradisaurus, Euskelosaurus, Jingshanosaurus, Massospondylus, Mussaurus, Sellosaurus, and Yunnanosaurus proved to be plateosaurians.