All About Japan: Japanese Flag: Image of the national flag suitable for printing.
Atlasgeo: Japan: Animated GIF image.
Flags of the World: Japan: National, governmental, royal, feudal, military, prefecture, and municipal flags.
Japan Access: National Flag and Anthem: History and contemporary use of the flag.
Japanese Flags: National, World War II, and Emperor's flags.
Japanese Flags: Includes flags of prefectures, cities, and island groups.
Theodora.com: Flag of Japan: Images in several sizes.