Norellius is an extinct genus of scleroglossan lizard from the Early Cretaceous of Mongolia. It is known from a well-preserved skull that was collected by an American Museum of Natural History expedition to Mongolia in 1923 and cataloged as AMNH FR 21444. After its initial cataloging, AMNH FR 21444 was not mentioned again in the scientific literature until 2004 when it was recognized as belonging to a potential early relative of modern groups of squamates such as gekkotans, amphisbaenians, dibamids, and snakes. AMNH FR 21444 was more fully described in a 2006 study that used high-resolution computed tomography to examine the skull and its braincase, and was designated to belong to a new genus and species, Norellius nyctisaurops, in 2015. The 2006 study incorporated the specimen into a phyl