Vivencio Baron Cuyugan Sr. (January 13, 1895 – March 16, 1971) was a Filipino politician, boxer, and one of the founders of the socialist guerrilla group Hukbalahap.

He was born in San Fernando, Pampanga, to Saturnino Pamintuan Cuyugan and Antonina Yutuc Baron.

[2] He married Felisa Amurao of Cabiao, Nueva Ecija[3] and had six children by her, namely: Aida, Fernando, Fe, Vivencio Jr., Panopio, and Dr. Ma.

There were children from other marriages: Estrella, Augustin, Saturnino, Syvestra, Antonia, Carlos, Manuel, and Juliet.

[5] In 1941, Cuyugan and several others founded the Hukbo ng Bayan Laban sa Hapon (Hukbalahap)[4] and acted as one of its commanders.