- a city in and the capital of Canada, in southeastern Ontario.
- a river in southeastern Canada, flowing southeast along the boundary between Ontario and Quebec into the St. Lawrence River at Montreal. 685 miles (1,105 kilometers) long.
- a city in northeastern Illinois, southwest of Chicago.
- a town in eastern Kansas.
- a member of a tribe of Algonquian people of Canada, forced into the Lake Superior and Lake Michigan regions by the Iroquois confederacy.
- the Ojibwe language as used by the Ottawa.
- the capital of Canada, in E Ontario on the Ottawa River: name changed from Bytown to Ottawa in 1854. Pop: 774 072 (2001)
- a river in central Canada, rising in W Quebec and flowing west, then southeast to join the St Lawrence River as its chief tributary at Montreal; forms the border between Quebec and Ontario for most of its length. Length: 1120 km (696 miles)