Suecoceras is an endoceratid (a kind of nautiloid cephalopod) that lived during the Middle Ordovician.

The siphuncle is proportionally large, 1/3 to 1/2 the shell diameter; ventral at the beginning, becoming subventral in the adult portion.

Septal necks are holochoanitic to slightly maxichaonitic, extending back to the previous septum and sometimes beyond.

The siphuncle takes up the entire apex, but is not swollen as in Chazyoceras or Nanno.

A typical species, S. barrande (Dewitz), whose fossil remains are known from Sweden (hence the name, Sueco- means "Swedish"), has a shell about 15 cm (5.9 in) long.