Pedro Tiangco Tuason was a prominent Filipino lawyer and government official.

Born in Balanga, Bataan on 15 September 1884 to Clemente Tuason and Josefa Tiangco, Tuason attended the public school in his town and at an escuela de segunda ensenanza.

He was sent to study in the United States as a government pensionado, attending the New Jersey State Normal School in Trenton, then the Georgetown University Law School in Washington, D.C., where he graduated with the Bachelor of Laws degree in 1908, and finally the Yale Law School where he took a post graduate course.

[1] Having passed the bar examinations in 1912, he was appointed Provincial Fiscal of Misamis, Surigao, Agusan (now Agusan del Norte and del Sur), and Ilocos Sur.

He became the Solicitor General in 1936, serving until 1938 when he was appointed associate justice of the Court of Appeals.