Zadar IV is a planet in the Zadar system. Zadar IV has large oceans filled with fish and other marine life.

In the 24th century, Starfleet oceanographer Lieutenant Harry Bernard, Sr. was stationed on Zadar IV with his son Harry Jr. They lived on the beach and Harry Jr. often saw dolphins playing in the ocean there. They were later the inspiration for his first attempt at sculpting. (TNG: "When The Bough Breaks")