noun

• An Algonquian people closely related to the Ojibwe; also spelt Ottowa.
• The Ottawa dialect of Ojibwe; also spelt Odawa or Odaawaa.
• A city in Ontario, Canada; capital city of Canada.
• (by synecdoche, metonymically) The federal government of Canada.
• A river flowing southeast between Ontario and Quebec, Canada into the St. Lawrence River.
• A number of places in the United States:
• A city, the county seat of LaSalle County, Illinois.
• A city, the county seat of Franklin County, Kansas.
• A township and unincorporated community therein, in Le Sueur County, Minnesota.
• A village, the county seat of Putnam County, Ohio.
• An unincorporated community in Ottawa County, Oklahoma.
• A town and unincorporated community in Waukesha County, Wisconsin.
• Some other townships, listed under Ottawa Township.
• A village, formerly a commune in the Ivory Coast.
• A suburb of Durban, KwaZulu-Natal, South Africa.
• A member of the Ottawa people.