O

Observatories

• Management and Operation of the Ocean Observatories Initiative (OOI)
• Ocean Observatories Initiative Facility Board (OOIFB) Administrative Support Office

Observatory

• Competition for the Management of Operations and Maintenance of the National Ecological Observatory Network (NEON)

Observing

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

OBSIC

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

Ocean

• Curatorial Stewardship of a National Collection of Geological Rock & Sediment Cores from Antarctica and the Southern Ocean
• Improving Undergraduate STEM Education: Pathways into the Earth, Ocean, Polar and Atmospheric & Geospace Sciences (GEOPAths)
• Management and Operation of the Ocean Bottom Seismometer Instrument Center (OBSIC)
• Management and Operation of the Ocean Observatories Initiative (OOI)
• Ocean Drilling Program (ODP)
• Ocean Observatories Initiative Facility Board (OOIFB) Administrative Support Office
• Ocean Technology and Interdisciplinary Coordination
• 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

ODP

• Ocean Drilling Program (ODP)

OE

• Operations Engineering (OE)

Office

• Navigating the New Arctic Community Office (NNA-CO)
• Ocean Observatories Initiative Facility Board (OOIFB) Administrative Support Office
• Platforms for Advanced Wireless Research (PAWR): Establishing the PAWR Project Office (PPO) (PAWR/PPO)
• Science Support Office for the International Ocean Discovery Program (IODP)

Office-National

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

Olfactory

• Cracking the Olfactory Code (Olfactory)

Operation

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

Operations

• Competition for the Management of Operations and Maintenance of the National Ecological Observatory Network (NEON)
• Disrupting Operations of Illicit Supply Networks (D-ISN)
• Operations Engineering (OE)

Operator

• Operator Selection for Two Regional Class Research Vessels (RCRV 2 and RCRV 3)
• Operator Selection for a Regional Class Research Vessel (RCRV #3)

Opportunities

• Arctic Research Opportunities
• Environmental Convergence Opportunities in Chemical, Bioengineering, Environmental, and Transport Systems (ECO-CBET)
• Established 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)
• NSF Engineering - UKRI Engineering and Physical Sciences Research Council Lead Agency Opportunity (ENG-EPSRC)

OPUS

• Opportunities for Promoting Understanding through Synthesis (OPUS)

Organismal

• Division of Integrative Organismal Systems Core Programs

Organizational

• ADVANCE: Organizational Change for Gender Equity in STEM Academic Professions (ADVANCE)

Organizations

• Science of Organizations (SoO)

Organoids

• Reproducible Cells and Organoids via Directed-Differentiation Encoding (RECODE)

Origin

• Origin of Life