Diane Overdiek was a Starfleet officer in the 24th century.
In 2353, she was listed as a Starfleet Operational Support Services officer on the directory placard at Starbase 32, Maxia sector. Her office was located in #35951. (TNG: "Violations", directory)
In the 2370s, she was named as a Fleet Ops officer on the dedication plaque of several Federation starships. (VOY: "Caretaker", dedication plaque; VOY: "Message in a Bottle", dedication plaque)
This character was only mentioned in writing.