Old - over
- old fold mountains
- old ice
- old irrigated soils
- old mountains
- old platform
- old resident
- old snow
- Old Wive's summer
- Old World
- Oligocene
- oligomictic lake
- oligopoly
- oligotrophic
- oligotrophic bog
- oligotrophic lake
- oligotrophic plant
- olive grove
- omnivore
- one-year ice
- onion-skin weathering
- onion-weathering
- ooze
- open burning
- open channel
- open field
- open forest
- open fracture
- open plant community
- open sea
- open surface channel
- open woodland
- opencast mining
- opening
- opening in sea-ice
- opolje
- opposition
- optical oceanography
- optical phenomenon in the atmosphere
- optimal humidity
- orbit of the Earth
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