骨齿鸟（学名：Osteodontornis）是一属已灭绝的海鸟。其下只有一个物种，为Osteodontornis orri，其名字是为纪念自然学家Ellison Orr。

骨齿鸟最初被认为是与鹱形目的信天翁有关，但牠们似乎是鹈鹕、鹳科或水禽的近亲。由于这些不明朗，牠们被分类到齿鸟目中。牠们在齿鸟目中的分类并未完全解决。在加拿大温哥华岛发现的Cyphornis magnus最初相信是属于始新世的，但现已认为是属于较骨齿鸟早些许的中新世早期。故此有指骨齿鸟可能是Cyphornis的异名。

Osteodontornis is an extinct seabird genus. It contains a single named species, Osteodontornis orri (Orr's Bony-toothed Bird, in literal translation of its scientific name), which was described quite exactly one century after the first species of the Pelagornithidae (Pelagornis miocaenus) was. O. orri was named after then-recently deceased naturalist Ellison Orr.