Collilongus
| Collilongus Temporal range:  | |
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| Genus: | Collilongus Borsuk−Białynicka & Sennikov, 2009 | 
| Species | |
| C. rarus Borsuk−Białynicka & Sennikov, 2009 (type) | |
Collilongus (meaning "long neck") is an extinct genus of small archosauriform, possibly a rauisuchian, known from Early Triassic (Olenekian age) rocks of Czatkowice 1, Poland. It was first named by Magdalena Borsuk−Białynicka; and Andriej G. Sennikov in 2009. The type and only known species is Collilongus rarus. It is a rare component of the Czatkowice 1 fauna, known only from vertebrae. Collilongus was a contemporary of the more common archosauriform Osmolskina.