- O-wave component
- Oamaru Stone
- oasis
- oberwind
- object lineation
- object-centre path
- oblique fabric or oblique foliation
- oblique fault
- oblique fold
- oblique joint
- oblique slip fault
- oblique-Si porphyroblast
- Oblique-Slip Fault
- obscuration
- obscured sky cover
- obscuring phenomenon
- obsequent
- obsequent fault-line scarp
- observational day
- Obsidian
- obsidianite
- obstructed stream
- obstruction moraine
- obstruction to vision
- occluded cyclone
- occluded front
- occlusion
- ocean
- ocean basin
- ocean circulation
- ocean current
- ocean floor
- ocean weather station
- ocean-floor spreading
- oceanic anticyclone
- oceanic climate
- oceanic crust
- oceanic heat flow
- oceanic high
- oceanic island
- oceanic province
- oceanic ridge
- oceanic rise
- oceanic stratosphere
- oceanic zone
- oceanicity
- oceanity
- oceanization
- oceanographic equator
- oceanographic model
- oceanographic station
- oceanographic survey
- oceanography
- oceanology
- Ochoan
- Ochrept
- octahedrite
- ODF
- off-reef facies
- offlap
- offset
- offset deposit
- offset ridge
- offset stream
- Offshore
- offshore bar
- offshore beach
- offshore current
- offshore slope
- offshore terrace
- offshore water
- offshore wind
- ogive
- oil
- oil accumulation
- oil column
- Oil Field
- oil floor
- oil pool
- oil reservoir
- oil rock
- oil sand
- oil seep
- Oil Shale
- oil trap
- oil zone
- oil-field brine
- oil-reservoir water
- oil-water contact
- oil-water interface
- oil-water surface
- Oiluvium
- Old Age
- old ice
- old lake
- old mountain
- Old Red Sandstone
- old snow
- old wives' summer
- oldland
- Oligocene
- Oligoclase
- oligomictic
- oligopelic
- oligotrophic
- olistolith
- olistostrome
- Olivine
- olivine-bronzite chondrite
- olivine-hypersthene chondrite
- olivine-pigeonite chondrite
- omission
- oncolite
- one-year ice
- Onesquethawan
- onionskin weathering
- onlap
- onshore
- onshore wind
- Onyx
- Oolite
- Oolitic
- ooze
- opacus
- Opal
- opalized wood
- Opaque
- opaque attritus
- opaque sky cover
- open bay
- open coast
- open fault
- open fold
- open harbor
- open ice
- open lake
- open pack ice
- open rock
- open sand
- open sea
- open system
- open water
- open-space structure
- opening
- opening trajectory
- operational unit
- operational weather limits
- Ophiolite Suite
- ophitic microstructure
- opposing wind
- opposite tide
- oppositely concave microfolds (OCMs)
- optical air mass
- optical depth
- optical horizon
- optical oceanography
- optical thickness
- optically effective atmosphere
- optimum moisture content
- ora
- orbicule
- Orbit
- orbital current
- ordinary tides
- ordinary-wave component
- Ordovician
- ore
- ore bed
- ore cluster
- ore control
- Ore Deposit
- ore district
- Ore Mineral
- ore of sedimentation
- ore shoot
- ore-lead age
- orebody
- organic geochemistry
- organic lattice
- organic mound
- organic reef
- organic soil
- organic texture
- organic weathering
- organogenic
- organolite
- orientation contrast (OC)
- orientation diagram
- oriented
- original dip
- Original Horizontality
- original valley
- orocline
- orocratic
- orogen
- orogene
- orogenesis
- Orogenic Belt
- orogenic cycle
- orogenic sediment
- orogenic unconformity
- Orogeny
- orogeosyncline
- orographic
- orographic cloud
- orographic lifting
- orographic occlusion
- orographic precipitation
- orography
- orohydrography
- orotath
- Orpiment
- Orthent
- Orthid
- orthobituminous coal
- orthochem
- orthochronology
- Orthoclase
- orthoconglomerate
- Orthod
- orthogeosyncline
- orthogneiss
- orthogonai fracture set
- orthohydrous coal
- ortholignitous coal
- orthomagmatic stage
- orthophotograph
- orthoquartzitic conglomerate
- Orthorhombic
- orthostratigraphy
- orthotectic stage
- orthotill
- Orthox
- Osagean
- osar
- oscillation ripple
- oscillation ripple mark
- Oscillation Ripple Marks
- oscillatory ripple mark
- oscillatory zoning
- Osos wind
- ostria
- Ostwald ripening
- ouari
- outburst
- Outcrop
- outcrop curvature
- outcrop map
- outcrop water
- outer atmosphere
- outer bar
- outer beach
- outer core
- outer harbor
- outer mantle
- outface
- Outfall
- outflow cave
- Outgassing
- outlet glacier
- outlet head
- outlier
- outside air temperature
- Outwash
- outwash apron
- outwash cone
- outwash drift
- outwash fan
- outwash plain
- outwash terrace
- outwash train
- oven
- overbank deposit
- overbank stage
- overburden
- overburdened stream
- overcast
- overconsolidation
- overdeepening
- overfalls
- overflow channel
- overflow ice
- overflow spring
- overflow stream
- overfold
- overhang
- overland flow
- overlap
- overlap fault
- overload
- overloaded stream
- overprint
- overprinting
- overrunning
- overseeding
- oversteepening
- overstep
- overthrust
- overthrust black
- overthrust fault
- overthrust nappe
- overthrust sheet
- overthrust slice
- overtide
- overturn
- overturned
- Overturned Fold
- overwash
- overwash mark
- overwash plain
- overwash pool
- oxbow
- Oxbow Lake
- Oxford Clay
- Oxfordian
- oxidate
- Oxidation
- Oxide
- oxidite
- Oxidized zone
- Oxisol
- oxoferrite
- oxygen deficit
- oxygen distribution
- oxygen isotope fractionation
- oxygen minimum layer
- oxygen ratio
- oxyphile
- oxysphere
- Oyashio
- ozocerite
- ozokerite
- ozone hole
- ozone layer
- ozonesonde
- ozonosphere
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