Caius Volusenus was a Roman tribune under Julius Caesar.

In 55 BC Caius was sent out by Caesar in a single warship to undertake a week-long survey of the coast of south eastern Britain prior to Caesar's invasion. He probably examined the Kent coast between Hythe and Sandwich. When Caesar set off with his troops however he arrived at Dover and saw that landing would impossible. Instead he travelled north and beached his ships near Walmer.

Volusenus failed to find the great natural harbour at Richborough , later used by Claudius in his later invasion. However our knowledge of the geomorphology of the Wantsum Channel that created that haven is limited and it may not have been suitable at the time.

In any case, there is no record of Caesar's reaction to Volusenus' apparent intelligence failings.