Broiliellus is most closely related to the genus Dissorophus, and both have been placed in the subfamily Dissorophinae.

A second species, Broiliellus brevis, from the Archer City bonebed in Texas was named in 1964 by Canadian paleontologist Robert Carroll; the holotype of this species is currently reposited in the Museum of Comparative Zoology.

[4] The most recent species to be described was Broiliellus reiszi in 2013 by Canadian paleontologist Robert Holmes and colleagues.

[5] The phylogenetic analysis of Schoch (2012) found that Broiliellus was most closely related to Dissorophus.

However, the three species of Broiliellus did not form their own clade, but rather a polytomy (unresolved evolutionary relationship) with Dissorophus.