Kapitan China Ong Tiang Swee, (Chinese: ???; pinyin: Wáng Chángshui; 3 August 1864 – 19 October 1950) was a renowned Chinese leader and businessman in Sarawak.
He was Kapitan China of Sarawak and President of the Chinese Chamber of Commerce, as well as an advisor on Chinese Affairs and confidant to Rajah Charles Brooke.
He was also the first Chinese nominated to the Sarawak Council Negri (Legislative Council) in 1937.