Propanoplosaurus is a genus of herbivorous nodosaurid dinosaur from the Early Cretaceous Patuxent Formation of Maryland, USA.

Along with dinosaur footprints, the impressions of a neonate nodosaurid, specimen USNM 540686, were found by Stanford in 1997.

[1] The type species, Propanoplosaurus marylandicus was named and described by Stanford, David Weishampel, and Valerie DeLeon in 2011.

It consists of the impressions of the back of the head together with a natural cast of the ribcage, some vertebrae, the right forelimb, the right femur, and a right foot.

Only the skull shows osteoderms, and the authors suggest this was a common developmental stage of all nodosaurids, together with a long middle section of the snout, which is characterised by a unique cross-pattern of the bone plates, probably formed by the triangular osteoderms of the maxillae.