Onaga may refer to:
- Onaga (Mortal Kombat), a Mortal Kombat character
- Onaga, Kansas, a city in the United States
- Onaga, the Hawaiian language name for the fish Etelis coruscans also known as ʻula,ʻula koaʻe or longtail red snapper
- Callistus Valentine Onaga (born 1958), Roman Catholic bishop
- Takeshi Onaga (1950–2018), Governor of Okinawa, Japan
- Hijiri Onaga (born 1995), Japanese football player
- Onaga Shale, a fossil-bearing geologic formation in Onaga, Nebraska
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