Tan Sri Datuk Peter Lo Su Yin (simplified Chinese: 罗思仁; traditional Chinese: 羅思仁; pinyin: Luō Sīrén; 19 May 1923 – 1 January 2020) was a Malaysian politician who served as the 2nd Chief Minister of Sabah from January 1965 to May 1967. He was a member of the Sabah Chinese Association (SCA).