Nit

• The egg of a louse
• Head lice (often known as "nits" in the United Kingdom & Australia)
• A trivial detail; the object of nitpicking
• An exceptionally tight poker player
• Nit (unit), a unit of luminance also called candela per square meter
• The Nits, a musical group
• National Invitation Tournament, a men's college basketball tournament
• Negative income tax, a proposed tax reform
• Neith, an Egyptian goddess
• Nat (information), a logarithmic unit of information or entropy

Schools

• National Institutes of Technology, Several Institutions of National Importance located in India
• Naval Institute of Technology, a school in Biliran, Philippines
• Northern Institute of Technology, a school in Germany
• Nekomi Institute of Technology, a fictional university in the anime/manga Oh My Goddess!
• Ningbo Institute of Technology, a university in Ningbo, China
• Nagoya Institute of Technology, a college in Nagoya, Japan
• Nippon Institute of Technology, a college in Saitama, Japan
• Nishinippon Institute of Technology, a college in Fukuoka, Japan