|Named By:||M. BorsukinBialynicka & A. G. Sennikov in 2009|
|Time Period:||Early Triassic|
|Classification:||| Chordata | Reptilia | Diapsida | Archosauromorpha | Archosauriformes ||
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-Bialynicka; 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.