Maze Sea Circuit (Japanese: 日本海間瀬サーキット) is a 1.243mile (2.000 km) Japanese motor racing circuit at Maze, Iwamuro-mura in the Nishikanbara District of Niigata Prefecture.
The circuit was established in 1967 by Dr. Yoshikazu Fujita, a local physician. In 1970 the track was paved and redesigned into a road racing course. Between 1978 and 1987 the track was closed.
When it reopened in 1987, racing was changed to a clockwise direction. The track layout was also realigned to improve safety conditions.
In September 2008, Round 5 of the D1 Grand Prix with Nissan sporting coupés was held at the circuit.