Desmond Lim Bak Chuan (Chinese: 林睦荃; pinyin: Lín Mùquán; born 1967) is a Singaporean politician. He was formerly the president of the opposition Singapore Justice Party (SJP), which joined forces with three other opposition parties (SPP, NSP and PKMS) to form the Singapore Democratic Alliance (SDA) in 2001. He became the SDA secretary-general in 2009 and SDA president in 2011 before stepping down from the position of SDA chairman after the 2020 general election.