Yeoh Ghim Seng BBM JP (Chinese: 杨锦成; pinyin: Yáng Jǐnchéng; Pe̍h-ōe-jī: Iôⁿ Gím-sêng) was a Singaporean politician who served as Speaker of the Parliament of Singapore between 1970 and 1989. He is one of the longest-serving speakers of any parliament in the world. Yeoh served briefly as the acting president of Singapore between the death of Yusof Ishak on 23 November 1970 and the inauguration of President Benjamin Sheares on 2 January 1971.