Inst may refer to:
- As "inst.", abbreviation for instant.
- The Royal Belfast Academical Institution, a grammar school in Belfast, Northern Ireland
- Tuskegee University, Alabama, United States
- Bannari Amman Inst of Tech, Tamil Nadu, India
- Instrumental
- As "inst.", abbreviation for "instante mense", meaning a date of the current month, such as "the 5th inst."