Pedro María Sison y Macasieb (January 18, 1885–June 12, 1938) was a senator of the Philippines, judge of the Court of First Instance, a statesman and philanthropist.

During the American colonial period, he helped his father restore peace and order in Binalonan and Urdaneta towns.

[2] In 1912, at the age of 27, Sison was elected to the Philippine Assembly, representing Pangasinan's 4th district.

Representing the Second Senatorial District of La Union, Pangasinan, and Zambales, Sison served as a senator during the Fourth and Fifth Legislature from 1916 to 1922.

[3] Together with Rafael Palma, Sison sponsored in 1916 a bill on women's suffrage that was approved by the Senate.