The Summer Sonic Festival is an annual two or three-day rock festival held at the same time in Osaka and Chiba. The majority of the bands playing in Osaka the first day go to Chiba the following day and vice versa. The line-up contains many Japanese rock musicians from both major and indie record companies, and also international acts. It also operates the festival Sonicmania, with an EDM focus, since 2011. Summer Sonic is an independent festival, owned by Creativeman Productions Ltd.

Summer Sonic Festival was founded in 2000 in Japan, with a focus on major national and international acts.

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