Abstract: A bilge water filter for filtering bilge water discharged being drained from the bilge of a vessel includes a casing having first and second ends and at least one sidewall extending between the first and second ends, an inlet extending through the first end of the casing, and an outlet extending through the second end of the casing. The bilge water filter also includes a filter media disposed in the casing, between the inlet and the outlet, the filter media being adapted to absorb contaminants present in the bilge water while allowing substantially contaminant-free bilge water to be discharged from the outlet of the bilge water filter. The bilge water filter is adapted to be externally mounted to the outer surface of the hull of a vessel (i.e., to the outer surface of the hull) for draining bilge water from the vessel, capturing contaminants inside the filter and discharging contaminant-free bilge water from the outlet of the filter.