• Blackwater Worldwide, a private military contractor and security consulting firm.
  • Blackwater USA, former name of Blackwater Worldwide (name change still in transition)
  • Blackwater: The Rise of the World's Most Powerful Mercenary Army, a book by Jeremy Scahill about the firm
• Blackwater (waste), a term used for sewage containing fecal matter, cf. greywater
• Blackwater fever, an acute kidney disease characterised by the leakage of blood from the kidneys into the urine, where it has a dark appearance when voided
• Black Water, an episode of NCIS, a TV series about the Naval Criminal Investigative Service

Place names

Australia

• Blackwater, Queensland, a mining town

Canada

• Black Water, Ontario

Republic of Ireland

• Blackwater, County Wexford, a village

United Kingdom

• Blackwater, Cornwall, a village in England
• Blackwater, Dorset, a hamlet in England
• Blackwater, Hampshire, a small town in England
• Blackwater, Isle of Wight, a village on the Isle of Wight, England
• Blackwater Arboretum in Hampshire, England

United States

• Blackwater, Arizona
• Blackwater, New Mexico
• Blackwater Canyon in West Virginia
  • Blackwater Falls State Park at the head of the Canyon
• Blackwater National Wildlife Refuge in Maryland

Music

• Blackwater (Altan album), an album by Altan
• Blackwater (MOFRO album), the debut album by the band MOFRO
• Blackwater an album by Joe Zawinul
• Blackwater Park, an album by the Swedish band Opeth
• Blackwaterside, a traditional English folk song. See Black Mountain Side
• Black Water, a song by The Doobie Brothers
• Black Water Child, song by folk singer/songwriter Fionn Regan

See also

• Blackwater river, a classification of river, with waters colored like black tea to coffee
• Blackwater River (disambiguation)
• Black Water (2007 film), a horror film set in Northern Australia