Ratu Popi Epeli Cakobau (1883–11 October 1936)[1][2] was a Fijian chief and politician.

He held the title of Vunivalu of Bau from 1914 until his death in 1936, and was also a nominated member of the Legislative Council.

Born Popi Epeli Senioli, he was the son of Josefa Celua, who was the third son of the Tui Viti Seru Epenisa Cakobau and Litia Samanunu.

Ratu Popi inherited the title from his cousin, Penaia Kadavulevu in 1914.

Like his predecessor, Ratu Popi was a parliamentarian in the Legislative Council of Fiji.