Tachibana Dōsetsu, born Betsugi Akitsura, also as Bekki Akitsura, and Bekki Dōsetsu, was a Japanese samurai of the Sengoku period who served the Ōtomo clan. He was the father of Tachibana Ginchiyo and adopted father of Tachibana Muneshige.
Dōsetsu born at Yoroigaoka Castle, Bungo Province.
He led an attack at Tachibana Castle and took both their castle and clan. He become the head of Tachibana clan name becoming Tachibana Dōsetsu. He was known as one of the wisest of the Ōtomo retainers and is remembered in part for a letter he sent other leading Ōtomo retainers that included a condemnation of the spread of Christianity in the Ōtomo's domain.
Under Otomo Sorin, Dōsetsu fought at Siege of Moji and Battle of Tatarahama.
Dōsetsu was in possession of a famous sword called 'Chidori'. One day, while he was still a young man, he was taking shelter under a tree, as it was raining. Suddenly, a bolt of lightning struck him. However, Dōsetsu used his Chidori to cut the Thunder God inside the lightning bolt, allowing him to survive. After this incident, he renamed his 'Chidori to Raikiri'.
He fought in 37 battles while about half of his body was paralyzed.