Waterloo most commonly refers to:

• Battle of Waterloo, 1815 battle where Napoleon's French army was defeated by Anglo-allied and Prussian forces
• Waterloo, Belgium

Waterloo may also refer to:

• Waterloo, New South Wales
• Waterloo, Queensland
• Waterloo, South Australia
• Waterloo Bay, now Elliston, South Australia
• Waterloo, Victoria
• Waterloo, Western Australia

• Waterloo, Nova Scotia
• Regional Municipality of Waterloo, a region in Ontario
  • Waterloo, Ontario, a city
  • Waterloo (federal electoral district)
  • Waterloo (provincial electoral district)
  • Waterloo County, Ontario (1853–1973)
  • University of Waterloo
• Waterloo, Quebec
• Waterloo Village, Saint John, a neighbourhood in Saint John, New Brunswick

• Waterloo, Dorset, England, a suburb of Poole
• Waterloo, Huddersfield, England, a suburb
• Waterloo, London, England, area around Waterloo Station
• Waterloo Place, London, a street in the St James's area
• Waterloo, Merseyside, England
  • Waterloo (UK Parliament constituency)
• Waterloo, Whixall, Shropshire, England
• Waterlooville, known earlier as Waterloo, Hampshire, England, a town

• Waterloo, North Lanarkshire, Scotland
• Waterloo, Perth and Kinross, Scotland

• Waterloo Bay, Northern Ireland

• Waterloo, Caerphilly, Wales

• Waterloo, Alabama
• Waterloo, California
• Waterloo, Georgia
• Waterloo, Illinois
  • Waterloo Historic District (Illinois), listed on the National Register of Historic Places (NRHP)
• Waterloo, Indiana, in DeKalb County
• Waterloo, Fayette County, Indiana
• Waterloo, Johnson County, Indiana
• Waterloo, Iowa
• Waterloo, Kansas
• Waterloo, Louisiana
• Waterloo, Maryland
• Waterloo (Princess Anne, Maryland), a historic home
• Waterloo State Recreation Area, in Michigan
• Waterloo, Clark County, Missouri, an unincorporated community
• Waterloo, Lafayette County, Missouri, an unincorporated community
• Waterloo, Montana
• Waterloo, Nebraska
• Waterloo Historic District (Warner, New Hampshire)
• Waterloo, Monmouth County, New Jersey
• Waterloo Village, New Jersey
• Waterloo, New York, a town
  • Waterloo (village), New York
• Waterloo (Albertson, North Carolina), a historic plantation house
• Waterloo, Ohio
• Waterloo, Oregon
• Waterloo, South Carolina
• Waterloo, Texas (former name for Austin, Texas)
• Waterloo, Clarke County, Virginia
• Waterloo, Culpeper County, Virginia
• Waterloo, Fauquier County, Virginia
• Waterloo, New Kent County, Virginia
• Waterloo, West Virginia
• Waterloo, Grant County, Wisconsin, a town
• Waterloo, Jefferson County, Wisconsin, a town
  • Waterloo, Wisconsin, a city within the town
  • Waterloo Downtown Historic District (Waterloo, Wisconsin)

• King George Island (South Shetland Islands), Antarctica, known in Russian as Ватерло́о ('Vaterloo')
• Waterloo Road, Hong Kong, a road in Kowloon, Hong Kong
• Waterloo, New Zealand
• Waterloo, Sierra Leone
• Waterloo, Suriname

• Waterloo (1929 film), a German silent film
• Waterloo (1970 film), an epic period war drama
• "Waterloo" (Mad Men), an episode of Mad Men
• Waterloo Road, a BBC drama series

• Waterloo & Robinson, an Austrian band
• Waterloo Music Company, a Canadian music publishing and musical instrument retailing firm
• Waterloo Records, an independent music store in Austin, Texas
• Waterloo (album), by ABBA, 1974
  • "Waterloo" (song), Eurovision winner in 1974
• "Waterloo" (Stonewall Jackson song), 1959
• "Waterloo", a song by IcedEarth from the 2004 album The Glorious Burden

• Waterloo (video game), a 1989 strategic computer game
• Waterloo Campaign (video game), a video game from Design, Inc
• Waterloo (board game), a Napoleonic board wargame
• Waterloo (blog post), a 2010 online commentary by David Frum about the Affordable Care Act
• Waterloo: The History of Four Days, Three Armies and Three Battles, a 2014 history book by Bernard Cornwell

• Waterloo Airport (disambiguation)
• Waterloo station (disambiguation)
• Waterloo (ship), the name of several ships
  • HMS Waterloo, the name of several ships of the Royal Navy

• Waterloo Chamber, Windsor Castle
• Waterloo (horse) (foaled 1969), a British thoroughbred racehorse
• Waterloo cheese, a British cheese
• Waterloo Cup, an English coursing event 1836–2005
• Waterloo F.C., an English rugby union team
• Waterloo Gasoline Engine Company, a former American tractor maker
• Waterloo Hydrogeologic, a former software and consulting company
• University of Waterloo, in Ontario, Canada

• Waterloo Town Hall, Merseyside, England
• Waterloo Town Hall, Sydney, New South Wales, Australia

• All pages with titles beginning with Waterloo
• All pages with titles containing Waterloo
• Battle of Waterloo (disambiguation)
• Waterloo Bridge (disambiguation)
• Waterloo Creek (disambiguation)
• Waterloo High School (disambiguation)
• Waterloo Historic District (disambiguation)
• Waterloo Memorial (disambiguation)
• Waterloo Road (disambiguation)
• Waterloo Square (disambiguation)
• "Waterloo Sunset", a 1967 song by The Kinks