WSV Helius is a water sports association (watersportvereniging) based in the Heliushaven of Hellevoetsluis, a historic fortified town in the Netherlands with direct access to the Haringvliet.

The club has more than 350 members and accommodates visiting boats up to 70 feet in length, with over 250 water berths and 75 shore berths available. Arriving visitors should moor at the D-steiger and check in with the harbourmaster at the harbour office.

If the harbourmaster is unavailable, visitors can call the provided numbers or report to the clubhouse, 't Havenhoofd. A card granting access to the grounds and toilet facilities is issued upon check-in.

The association organises regular events and races on and around the Haringvliet, and the site includes a clubhouse, restaurant, and modern sanitary facilities.