- The capital of Canada, located in the province of Ontario.
- A river flowing SE between Ontario and Quebec into the St. Lawrence River.
- A city in Illinois.
- A town in Ohio.
- An Algonquian people closely related to the Ojibwe; also spelt Ottowa.
- The Ottawa dialect of Ojibwe; also spelt Odawa or odaawaa, Odaawaa.
- French: Ottawa
- Italian: Ottawa
- Spanish: Ottawa
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