NII

Nii or NII may refer to:

Initialisms

National Information Infrastructure, a telecommunications policy buzzword, coined under the Clinton Administration in the United States
National Institute of Immunology (disambiguation)
National Institute of Informatics, a Japanese research institute for the advancement of studies in informatics
National Insurance Institute of Israel (Bituah Leumi)
Nautschno-issledovatelskiy institut ("science and research institute"), part of the Russian-language name of a large number of Soviet and post-Soviet research institutions
Net Interest Income, a financial term
Non-Intrusive Inspection of cargo containers
Nuclear Installations Inspectorate, part of the UK Office for Nuclear Regulation
Non-Individual Investor (India), resident Indian individuals, Non-Resident Indians (NRIs), (Hindu Undivided Families (HUFs), Companies, Corporate Bodies, Scientific Institutions, Societies, and Trusts who apply for more than ₹2 lakhs of IPO shares

Nii language, spoken in the highlands of Papua New Guinea
NII Holdings, a wireless telecommunications company with operations in Latin America, based in Reston, Virginia
N-II (rocket), Japanese rocket based on the U.S. Thor/Delta family