Nit or NIT may refer to:
- The egg of a louse
- Head louse (often known as "nits" in the United Kingdom, Australia and New Zealand)
- A trivial detail; the object of nitpicking
- Nit (unit), a unit of luminance equivalent to one candela per square metre (1 cd/m²)
- Nits (band), a Dutch musical group
- National Invitation Tournament, a men's college basketball tournament in the United States
- National Indigenous Times, Indigenous Australian affairs newspaper
- Nagpur Improvement Trust, a local civil government body in Nagpur, India
- Negative income tax, a proposed tax reform
- Neith, an Egyptian goddess
- Nat (information), a logarithmic unit of information or entropy
- Norfolk International Terminals, a port operated by the Virginia Port Authority in Norfolk, Virginia
Read more about Nit: Schools