Albert Mangaratua Tambunan (25 September 1910 – 12 December 1970) was the chairman and the general secretary of the Indonesian Christian Party, and the first deputy speaker of the People's Representative Council, serving for two terms.

He was also famous for being the only Christian representative in the Working Body of the Central Indonesian National Committee.

Albert Mangaratua Tambunan was born in Tarutung, North Sumatra, Dutch East Indies on 25 September 1910.

Tambunan was chosen as the general secretary of the Indonesian Christian Party at its first congress from 6–8 December 1945 in Surakarta.

Tambunan went to West Germany and India, and in 1968, he attended the International Conference of Social Ministers in New York.