Maria Ulfah Soebadio Sastrosatomo (18 August 1911 – 15 April 1988), better known by her first married name Maria Ulfah Santoso, was an Indonesian politician and women's rights activist who served as Minister of Social Affairs under Prime Minister Sutan Sjahrir.

Despite pressure to become a doctor, she graduated with a degree in law from Leiden University in 1933; while in the Netherlands she also became involved in the Indonesian nationalist movement.

She was a member of the Committee for Preparatory Work for Indonesian Independence, and later became the social minister from March 1946 to June 1947.

Born into the prominent Djajadiningrat family in Serang, Bantam Residency, Dutch East Indies on 18 August 1911,[1] Santoso was the daughter of R.A.A.

[2] During her studies, she became involved with the Indonesian nationalist movement and its leaders, including Mohammad Hatta and Sutan Sjahrir.

[2] In 1934, Santoso returned to Batavia and took a teaching job at the Muhammadiyah-run teacher's college there, refusing a position in the colonial government to do so.

While teaching, she continued to be active in the nationalist movement, helping Adam Malik to establish the news agency Antara.

[7] After the Japanese occupied Indonesia in 1942, Santoso left her work as a teacher and found employment as legal assistant to Soepomo, who later became the country's first minister of justice.

[2] In 1949, Santoso was part of a committee tasked with preparing a marriage bill "in keeping with the spirit of modern times".

[2] Santoso married again, this time to Indonesian Socialist Party figure Soebadio Sastrosatomo, on 10 January 1964.