| Naval officer ranks |
|---|
| Flag officers |
| Senior officers |
| Junior officers |
Sub-lieutenant is usually a junior officer rank, used in armies, navies and air forces.
In most armies, sub-lieutenant is the lowest commissioned officer rank. However, in Brazil, it is the highest non-commissioned rank, and in Spain, it is the second highest non-commissioned rank.
As a naval rank, a sub-lieutenant ranks below a lieutenant.