Rodolfo Tiamson Ganzon Sr. (25 March 1922 - 29 October 2003)[1] was a Filipino politician and lawyer from Iloilo who became Senator of the Philippines and was known as the Grand Timawa (Freeman).

[3] In 1961, he left the mayorship to successfully reclaim his post as Congressman of the 2nd District, serving until 1963 when he was elected to the Philippine Senate as a Nacionalista candidate, staying in office until 1969.

As a senator, Ganzon headed the committees on government reorganization, health and labor and immigration, civil service, and agriculture and natural resources.

In 1971, he was again elected Mayor of Iloilo City but was removed from office in October of that year following the declaration of martial law by President Ferdinand Marcos, whom he feuded with as senator.

[1][2][4] He subsequently became one of the longest serving political detainees during the dictatorship, being placed under military custody in 1978 and then moved to house arrest until the fall of the regime in 1986.