凹齿龙科（学名：Rhabdodontidae）是群生存于白垩纪的草食性鸟脚下目恐龙。凹齿龙科的外表看似大型、结实的棱齿龙类，并拥有深头颅骨与颌部。

在2002年，大卫·威显穆沛（David B. Weishampel）等人首次提出凹齿龙科，范围是：查摩西斯龙与凹齿龙的最近共同祖先，以及其最近共同祖先的所有后代。在2005年，保罗·赛里诺（Paul Sereno）将凹齿龙科定义为：包含凹齿龙在内，但不包含沃克氏副栉龙在内的最大演化支。凹齿龙科目前包含：凹齿龙（模式种）、查摩西斯龙、可能还有栅齿龙与木他龙。化石已发现于欧洲与澳洲，生存年代为白垩纪晚期，约1亿到6500万年前。

Rhabdodontids were herbivorous ornithopod dinosaurs from the Cretaceous Period. Rhabdodontids were similar to large, robust "hypsilophodonts", with deep skulls and jaws. The family was first proposed by David B. Weishampel and colleagues in 2002. The rhabdodontids were defined as "the most recent common ancestor of Zalmoxes robustus and Rhabdodon priscus and all the descendants of this common ancestor". In 2005, Paul Sereno defined the family as "the most inclusive clade containing Rhabdodon priscus but not Parasaurolophus walkeri". The Rhabdodontidae includes the type genus Rhabdodon, Zalmoxes, Mochlodon and possibly Muttaburrasaurus. Rhabdodontid fossils have been found in Europe and Australia in formations dating from the Early to Late Cretaceous, 100 to 66 million years ago. Ősi et al. (2012) proposed that Rhabdodon underwent gigantism on the mainland, as opposed to Zalmoxes and Mochlodon experiencing nanism on island habitats. In 2013, Darren Naish discovered a tiny rhabdodont tibia from Sebeș, Romania, turning out to be the smallest known; a paper (Brusette et al 2013.) later in the same year identified it as Zalmoxes, cf. Z. shqiperorum.