Heliushaven is an accessible, quiet outer harbour located at Heliushaven 10 in Hellevoetsluis, Zuid-Holland.

It sits just outside the historic fortress town and has a direct open connection to the Haringvliet; via the lock in the Haringvlietdam, the Haringvliet in turn provides a swift link to the Noordzee.

Multiple marinas, both commercial and association-run, line the harbour. The large entrance gate to Heliushaven is closed to cars at night, though a dedicated walkway for pedestrians and cyclists remains open at all times.

The harbour is managed by WV Hellevoetsluis, and the harbourmaster can be reached by phone or email for mooring assistance.