O

Observatories

• Critical Zone Observatories (CZO)
• Management and Operation of the Ocean Observatories Initiative (OOI)

Observatory

• Critical Zone Observatory National Office (ESNO)
• Management and Operation of the Gemini Observatory
• Management and Operation of the National Optical Astronomy Observatory (NOAO)
• Management and Operations of the Arecibo Observatory

Observing

• Arctic Observing Network (AON)
• Lower Atmosphere Observing Facilities (LAOF)

OBSIC

• Management and Operation of the Ocean Bottom Seismometer Instrument Center (OBSIC)

Ocean

• Antarctic Ocean and Atmospheric Sciences
• Curatorial Stewardship of a National Collection of Geological Rock & Sediment Cores from Antarctica and the Southern Ocean
• Management and Operation of the Ocean Bottom Seismometer Instrument Center (OBSIC)
• Management and Operation of the Ocean Observatories Initiative (OOI)
• Ocean Drilling Program (OD)
• Ocean Technology and Interdisciplinary Coordination
• Operations Management of the Drilling Vessel JOIDES Resolution for the International Ocean Discovery Program (IODP)
• Science Support Office for the International Ocean Discovery Program (IODP)
• U.S. Science Support Program associated with the International Ocean Discovery Program (USSSP-IODP)

Oceanographic

• Oceanographic Facilities and Equipment Support

Oceanography

• Biological Oceanography
• Chemical Oceanography
• Physical Oceanography

OD

• Ocean Drilling Program (OD)

OE

• Operations Engineering (OE)

Office

• Continental Scientific Drilling Coordination Office for the Division of Earth Sciences (CSDCO)
• Critical Zone Observatory National Office (ESNO)
• Platforms for Advanced Wireless Research (PAWR): Establishing the PAWR Project Office (PPO) (PAWR/PPO)
• Science Support Office for the International Ocean Discovery Program (IODP)
• Tomorrow's Internet Project Office (TIPOFF)

Office-National

• Domestic Nuclear Detection Office-National Science Foundation Academic Research Initiative (ARI)

Olfactory

• Cracking the Olfactory Code (Olfactory)

Operation

• Competition for the Management and Operation of the National Center for Atmospheric Research
• Management and Operation of the Advanced Modular Incoherent Scatter Radar (AMISR) Facilities at Poker Flat, AK, and Resolute Bay, Canada (AMISR-M&O)
• Management and Operation of the Gemini Observatory
• Management and Operation of the National Optical Astronomy Observatory (NOAO)
• Management and Operation of the Ocean Bottom Seismometer Instrument Center (OBSIC)
• Management and Operation of the Ocean Observatories Initiative (OOI)

Operations

• Management and Operations of the Arecibo Observatory
• Operations Engineering (OE)
• Operations Management of the Drilling Vessel JOIDES Resolution for the International Ocean Discovery Program (IODP)

Opportunities

• Arctic Research Opportunities
• Experimental Program to Stimulate Competitive Research: Workshop Opportunities (EPS-WO) (EPS-WO)
• GEO Opportunities for Leadership in Diversity (GOLD)
• Opportunities for Promoting Understanding through Synthesis (OPUS)

Opportunity

• Japan-US Network Opportunity 2 (JUNO)

Optical

• Management and Operation of the National Optical Astronomy Observatory (NOAO)
• Theory Institute in Atomic, Molecular and Optical Physics

OPUS

• Opportunities for Promoting Understanding through Synthesis (OPUS)

Organismal

• Division of Integrative Organismal Systems
  

Organisms

• Antarctic Organisms and Ecosystems

Organizations

• Science of Organizations (SoO)
• Virtual Organizations as Sociotechnical Systems (VOSS)

Origin

• Origin of Life