Carlene Mathews was a Human Starfleet officer.
In 2364, she held the rank of Ensign. She, along with Carol Mathews, was transferred from the USS Equicon to a new posting on stardate 41547.3. (TNG: "Conspiracy")
The character was never mentioned in dialog; the name comes from a mission order. The word "and" connecting the two characters might denote a family connection.