Onondaga

Onondaga may refer to:

Native American/First Nations

Onondaga people, a Native American/First Nations people and one of the five founding nations of the Iroquois League
Onondaga (village), Onondaga settlement and traditional Iroquois capital
Onondaga language

Onondaga Limestone, a layer of dense limestone that outcrops in New York and Ontario, Canada
Onondaga Cave State Park, in Leasburg, Missouri, named after the geological formation
Onondaga Falls, one of 24 named waterfalls in Ricketts Glen State Park, in Pennsylvania

Onondaga, Ontario, a rural community in the County of Brant, province of Ontario

Onondaga County, New York, a county near the center of New York State
- Onondaga Reservation, a reservation, which is Onondaga Nation territory
- Onondaga, New York, a town in Onondaga County
  - Onondaga Hill, New York, a hamlet in the Town of Onondaga
- Onondaga Creek, runs through Syracuse to Onondaga Lake, in Onondaga County
- Onondaga Lake, adjacent to Syracuse, in Onondaga County
- Onondaga Lake Park, a park on the eastern shore of Onondaga Lake
- Onondaga Park, a park on the south side of Syracuse
Onondaga Township, Michigan, a township in Michigan's lower peninsula
- Onondaga, Michigan, an unincorporated community in Onondaga Township

Onondaga Community College in New York
Onondaga Hill Middle School in New York
HMCS Onondaga (S73), a submarine in the Royal Canadian Navy
USS Onondaga, three ships of the US Navy
The Onondagas, nickname of the 122nd New York Volunteer Infantry regiment in American Civil War