lieutenant junior grade
- A commissioned officer of the United States Navy whose rank is above an ensign's and below a lieutenant, or a corresponding rank in other navies.
- A commissioned officer in the United States Coast Guard, Public Health Service, or National Atmospheric and Oceanic Administration whose rank is above an ensign and below a lieutenant.
When used as a title, it is always capitalized.
- Example: Lieutenant Junior Grade John Smith. The rank of lieutenant junior grade corresponds to pay grade O-2.
Abbreviations: 1st Lieutenant, 1st Lt., and 1st LT.