|This article is about the Tyranid Hive Fleet, for the Space Hulk see Scylla (Space Hulk)|
Hive Fleet Scylla is a Tyranid Hive Fleet carving a path through the Segmentum Pacificus. Its path runs parallel to that of a twin fleet known as Hive Fleet Charybdis. These two Hive Fleets are the closest known Tyranid threat to Terra. They will also assail Saim-Hann unless the Craftworld alters its current course.