The Beyond the Sea Tag Team Championship is a professional wrestling tag team championship created and promoted by the Seadlinnng promotion. The inaugural champions were crowned on July 25, 2018, when Borderless (Rina Yamashita and Yoshiko) defeated Nanae Takahashi and Tsukasa Fujimoto.
Like most professional wrestling championships, the title is won as a result of a scripted match. There have been a total of 16 reigns and two vacancies shared among 15 teams and 20 wrestlers. The titles are currently held by Colorful Bouquet Toss (Unagi Sayaka and Honori Hana) who are in their first reign as a team and individually.
On July 25, 2018, Borderless (Rina Yamashita and Yoshiko) defeated Nanae Takahashi and Tsukasa Fujimoto to become the inaugural champions. On February 28, 2019, the current champions Arisa Nakajima and Ayame Sasamura vacated the title after Sasamura suffered a leg injury. On March 20, Nakajima alongside Sae defeated Himeka Arita and Miyuki Takase to win the vacant championship.
As of , , there have been a total of 16 reigns shared between 15 teams composed of 17 individual champions and two vacancies. The inaugural championship team was Borderless (Rina Yamashita and Yoshiko). The team Las Fresa de Egoistas (Asuka and Makoto) has the most reigns at two times, while individually, Arisa Nakajima has the most reigns at four times. As a team, Asuka and Makoto has the longest reign at 546 days in their second reign as a team, while Nakajima and Sae has the shortest at 39 days. Nanae Takahashi is the oldest champion at 42 years old, while Asuka is the youngest at 22 years old.
Unagi Sayaka and Honori Hana are the current champions in their first reign as a team, as well as individually. They defeated Mio Shirai and Sumire Natsu on December 26, 2025, at SEAdLINNNG 2025 Final Battle!.
As of , .