渥太华县可以指

• 渥太华县 (俄亥俄州)
• 渥太华县 (堪萨斯州)
• 渥太华县 (奥克拉荷马州)
• 渥太华县 (密歇根州)

Ottawa County is the name of four counties in the United States:

• Ottawa County, Kansas
• Ottawa County, Michigan
• Ottawa County, Ohio
• Ottawa County, Oklahoma