Nihon System Co., Ltd. (株式会社日本システム), formerly known as Japan System Co., Ltd. (株式会社日本システム)[1], was a Japanese video game developer, publisher, and distributor.

After Nihon System's bankruptcy in 2008, a new company was established on January 30, 2009, Fluke Co., Ltd. (株式会社フロック), which inherited much of Nihon System's business and mainly acts as an arcade game distributor.