The military rank of lieutenant, in the United States Armed Forces military branches of the United States Navy, United States Coast Guard, and the several uniformed civilian commissioned services of the National Oceanic and Atmospheric Administration with their National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA-COO), and the medical United States Public Health Service with their United States Public Health Service Commissioned Corps (PHS-CC), is divided between the following:
- Lieutenant (O-3), equivalent to a Captain in the U.S. Army, Air Force & Marines
- Lieutenant junior grade (O-2), sometimes referred as "lieutenant j.g."
In the United States Army, Air Force, and the Marine Corps, it is divided between:
- First lieutenant (O-2), sometimes called simply "lieutenant"
- Second lieutenant (O-1), equivalent to an Ensign in the Navy, Coast Guard, NOAA-COO & PHS-CC
During the American Civil War (1861–1865), brevet second lieutenants in the federal Union Army and southern Confederate States Army were sometimes also known as "third lieutenants".
Civilian police and fire departments in the United States may also use the rank of lieutenant.
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A lieutenant of the United States Navy -
A lieutenant of the United States Army -
United States Coast Guard Lieutenant Bobby Wilks -
A United States Marine receives a promotion to first lieutenant -
A lieutenant of the New York Metropolitan Transportation Authority Police
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