RSK Sanyo Broadcasting Co., Ltd. (RSK山陽放送株式会社, Āruesukē San'yō Hōsō Kabushikigaisha) is a Japanese television and radio broadcaster in Okayama and Kagawa.

The abbreviation, RSK originates in the former name in Japanese (Radio San'yō Kabushikigaisha, ラジオ山陽株式会社).

It is affiliated with Japan Radio Network (JRN), National Radio Network (NRN), and Japan News Network (JNN).

RSK Radio 1494 kHz; 91.4 MHz FM RSK Okayama Television RSK Okayama Digital Television