NFI

Look up NFI in Wiktionary, the free dictionary.

National Fatherhood Initiative
National Fisheries Institute, a trade association in the USA
National Forest Inventory
New Flyer Industries
Net Foreign Investment, a macroeconomic principle
Netherlands Forensic Institute (in Dutch: Nederlands Forensisch Instituut)
Newfrontiers, a group of charismatic churches that used to be known as NFI (New Frontiers International)
Netball Federation of India, national body of netball in India.
Nitrate Free Interval - A recommended time-frame to be nitrate-free (i.e. not administer the drug) in the pharmacotherapy of angina using nitrates, especially long-acting nitrates in ointment/topical form
Non-Food Item, in humanitarian operations parlance
National identifier code for Norfolk Island in international sporting competitions
Norwegian Film Institute
Not Further Identified, in military intelligence parlance