- Greaser Basin, a depression in Lake County
- Greaser Canyon, a valley in Lake County
- Greaser Lake, a lake in Lake County
- Greaser Reservoir, a reservoir in Lake County
- Greaser Ridge, a ridge in Lake County
- Great Basin Historical Marker, a park in Harney County
- Great Basin Waterhole, a reservoir in Lake County
- Greek Creek, a stream in Douglas County
- Greeley Bar, a bar in Malheur County
- Greeley Ranch in Malheur County
- Greeley Reservoir, a reservoir in Malheur County
- Green Creek, a stream in Lake County
- Green District Sewage Disposal Ponds in Douglas County
- Green Flat, a plain in Harney County
- Green Flat Reservoir, a reservoir in Harney County
- Green Gulch, a valley in Malheur County
- Green Lake, a lake in Lane County
- Green Mountain Lookout, a building in Lake County
- Green Oaks County Park, a park in Douglas County
- Green Pond, a reservoir in Malheur County
- Green Reservoir, a reservoir in Lane County
- Green Ridge, a ridge in Lane County
- Green Ridge Creek, a stream in Douglas County
- Green Rock Mine in Lane County
- Green Spot Spring, a spring in Malheur County
- Green Spring, a spring in Malheur County
- Green Valley, a valley in Douglas County
- Green Valley Spring, a spring in Lake County
- Greene Ranch in Malheur County
- Greenley Gulch, a valley in Harney County
- Greenman Creek, a stream in Douglas County
- Greenshaw Creek, a stream in Lane County
- South Creek, a stream in Lane County
- South Creek Reservoir, a reservoir in Harney County
- South Cross Canyon, a valley in Malheur County
- South DC Waterhole, a reservoir in Lake County
- South Dagus Reservoir, a reservoir in Crook County
- South Deer Creek Grange, a building in Douglas County
- South Diamond Canal, a canal in Harney County
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- South Drummond Basin Reservoir, a reservoir in Malheur County
- South Dry Creek Reservoir, a reservoir in Malheur County
- South Eel Campground (historical), a park in Coos County
- South Flat, a plain in Lake County
- South Fork Bald Mountain Creek, a stream in Curry County
- South Fork Beaver Creek, a stream in Lake County
- South Fork Billy Creek, a stream in Douglas County
- South Fork Bridge Creek, a stream in Lake County
- South Fork Brownie Creek, a stream in Lane County
- South Fork Buck Creek, a stream in Lane County
- South Fork Calapooya Creek, a stream in Douglas County
- South Fork Camas Creek, a stream in Coos County
- South Fork Camp Creek, a stream in Crook County
- South Fork Carter Creek, a stream in Malheur County
- South Fork Catching Creek, a stream in Coos County
- South Fork Cedar Creek, a stream in Lane County
- South Fork Cemetery in Coos County
- South Fork Cherry Creek, a stream in Coos County
- South Fork Chilcoot Creek, a stream in Lane County
- South Fork DeGarmo Canyon, a valley in Lake County
- South Fork Deep Creek, a stream in Lake County
- South Fork Deer Creek, a stream in Douglas County
- South Fork Elk Creek, a stream in Coos County
- South Fork Elk River, a stream in Curry County
- South Fork Fish Creek, a stream in Malheur County
- South Fork Flagler Creek, a stream in Douglas County
- South Fork Floras Creek, a stream in Curry County
- South Fork Fourmile Creek, a stream in Coos County
- South Fork Gettings Creek, a stream in Lane County
- South Fork Groundhog Creek, a stream in Lane County
- South Fork Hinkle Creek, a stream in Douglas County
- South Fork Jackass Creek, a stream in Harney County
- South Fork King Creek, a stream in Lake County
- South Fork Lobster Creek, a stream in Curry County
- South Fork Malheur River, a stream in Malheur County
- South Fork Matson Creek, a stream in Coos County
- South Fork McDowell Creek, a stream in Lake County
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