The Beyond the Sea Single Championship (BEYOND THE SEA SINGLE 王座 or BEYOND THE SEAシングル王座[4], Biyondo za shī shinguru ōza) is a women's professional wrestling championship owned by the Seadlinnng promotion.

The title, which is situated at the top of Seadlinnng's championship hierarchy, was introduced on October 3, 2018, and the inaugural champion was crowned on November 1, 2018, when Nanae Takahashi defeated Arisa Nakajima in the finals of an eight-woman tournament.

[5] The title was vacated once as a result of former champion Yoshiko taking time off to rehabilitate nagging injuries.

On November 1, 2018, Nanae Takahashi, the founder of Seadlinnng, defeated Arisa Nakajima in the finals of an eight-woman single-elimination tournament to become the inaugural champion.

[9] On October 19, Hiroyo Matsumoto defeated Itsuki Aoki in the finals of a ten-woman single-elimination tournament to win the vacant championship.