Barangay Tubeng got its name from the word "Tubong" which mean spring, the place where the people seen a handsome  man which disappeared after taking a bath and they believed that the man they saw was TOSEBENG, the lord of the B'laan tribe. In 1978, It became the sitio of Barangay Palian, Where Cesar Dug was appointed as first sitiio  leader. Year after, the PANAMIN came and they helped the B'laan people to settle in one place. Mr. Sudaria, an Ilocano, donated six (6) hectares of his farm to be used as barangay site for the cultural minorities and later when the Ilocanos came they change the name Tubong to "Tubeng".

Barangay tubeng created in September 14,1989, with a total land area of 575 hectares. Residential land 8 hectares; 371 for agricultural and 80 hectares for forestral land. It has a distance of 12 kilometers from the Municipality of Tupi and its boundaries in North by Progressive Farm, on the South by Barangay Lunen, on the East by Barangay Palian and on the West by Barangay Lam-aps, Banga, South Cotabato. Its terrain types is plain (25%), hilly (30%) and mountainous (45%). 

Settled by a mixture of 90% B'laans, 5% Muslims, 3% Ilocanos and 1% Ilonggos and Cebuanos. The majority of the constituents are protestants by religion. It consists of 4 main Puroks and 2 sitios as namely: Sitio Atbangan and Sitio Barnate.

Barangay Hall, Barangay Health Station and Water System were built under the administration of Barangay Captian Samuel Damucom, the first Barangay Captain and served the barangay for eight (8) years. In 1997, Armando Palate was elected as Barangay Captain and serving the community up to the present.

In 1999, Tubeng has a total population of 1,590. Its main products and plants cultivated  are corn, palay, banana and coconut. Other income generating projects are hogs raising, cattles and backyard gardening. It has a potential tourist spots ans attraction located at Sitio Atbangan and they called it at OPING Falls.