IFA

• Independent financial adviser, a type of financial services professional in the UK
• Index Fund Advisors
• Institute and Faculty of Actuaries, representing actuaries in the UK
• Institute of Actuaries, in England, Wales and Northern Ireland
• Faculty of Actuaries, in Scotland
• Institute of Financial Accountants, representing accountants in the UK
• International Fiscal Association
• International Forfaiting Association

• Intercollegiate Fencing Association
• International Fistball Association

;Football

• Indian Football Association, West Bengal, India
• Indoor Football Alliance
• Intercollegiate Football Association, college football organization, 1873–1893
• Iraq Football Association
• Irish Football Association, in Northern Ireland
• Islamabad Football Association
• Israel Football Association

• Illinois Family Action, the lobbying arm of the Illinois Family Institute in the US
• India Foundation for the Arts, a philanthropic organization
• Indo-GDR Friendship Association, in India
• Industrieverband Fahrzeugbau, East German vehicle manufacturer
• Institute for Archaeologists, in the UK
• Institute for Astronomy, University of Hawaii group that maintains the Mauna Kea Observatory
• Institute for Astronomy (Edinburgh)
• Institute for Occupational Safety and Health of the German Social Accident Insurance, a German research institute near Bonn
• International Federation on Ageing
• International Fertilizer Industry Association, represents the global fertilizer industry
• International of Anarchist Federations, L'international des Federations Anarchistes
• Internationale Funkausstellung Berlin, a consumer electronics trade fair
• Irish Farmers' Association
• New York University Institute of Fine Arts, a graduate school of New York University

• Ifá, a system of divination that originated in West Africa
• Ifa, a character in 2020 video game Genshin Impact
• Inter-Island Ferry Authority, a ferry service in Alaska
• Interconnexion France-Angleterre, the HVDC Cross-Channel interconnector for the transfer of electricity between France and England
• Interest Flooding Attack, a denial-of-service attack
• Interferometer, a device to measure the interference pattern caused by differing waves
• Indirect Fluorescent Antibody, test
• Incomplete Freund's adjuvant, an antigen solution to boost the immune system
• In-Flight Abort, test in spaceflight industry
• Integrated framing assembly, a type of construction product used with Insulating concrete forms.

• Aífe, a character in Irish mythology
• Aoife, an Irish given name
• Ivar F. Andresen (1896–1940), Norwegian opera singer

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