Su Jia-chyuan (or Su Chia-chyuan; ; born 22 October 1956) is a Taiwanese politician of the Democratic Progressive Party (DPP) who served as the President of the Legislative Yuan from 2016 to 2020.
As the first non-Kuomintang President of the Legislative Yuan, Su is an at-large legislator and previously Commissioner of Pingtung County, and held national posts as Minister of the Interior and Minister of Agriculture under President Chen Shui-bian's administration. From May to August 2020, he briefly served as Secretary General to the President under the Tsai Ing-wen administration.
After graduating from National Pingtung Senior High School, Su studied food science as an undergraduate at National Taiwan Ocean University and graduated with a bachelor's degree in 1979. He then earned a Master of Public Affairs (M.P.A.) from National Sun Yat-sen University.
In 2010, Su narrowly lost to Jason Hu in the election for Mayor of Taichung.
The DPP presidential candidate, Tsai Ing-wen, announced Su as her running mate in the 2012 presidential election. However, the ticket lost to the incumbent president Ma Ying-jeou, who sought a second term.
In 2016 legislative elections Su placed on the proportional representation ballot, and won a seat in the Legislative Yuan.
Su was elected the eleventh President of the Legislative Yuan on 1 February 2016, when the members of the ninth Legislative Yuan met for the first time. Su became the first DPP and non-KMT speaker in the Legislative Yuan.
Su was named Secretary-General to the President on 20 May 2020. He resigned on 2 August 2020, following allegations of bribery against his nephew, legislator . In May 2022, Su succeeded Chiou I-jen as chairperson of the TaiwanâÂÂJapan Relations Association. in January 2026, Su was named chair of the Straits Exchange Foundation.
Su was impeached by the Control Yuan on 3 September 2012, for illegally constructing a luxury farmhouse on agricultural land without engaging in any agriculture. Su's villa, built on agricultural land, was a controversial issue in the 2012 presidential elections.