Sylvia Lim Swee Lian is a Singaporean politician, lawyer, former police officer and Temasek Polytechnic law lecturer. A member of the opposition Workers' Party (WP), she had been a Non-Constituency Member of Parliament between 2006 and 2011 of the 11th Parliament of Singapore. She represented the Serangoon division of Aljunied GRC between 2011 and 2020, and has been Member of Parliament (MP) representing the Paya Lebar division of Aljunied GRC since 2020. Lim has been the chairwoman of the Workers' Party since 2003.

The Workers' Party is a major centre-left political party in Singapore and one of the three contemporary political parties represented in Parliament, alongside the governing People's Action Party (PAP) and the opposition Progress Singapore Party (PSP). It is currently the largest and oldest opposition party in Parliament, having contested every parliamentary election since 1959 against the dominant PAP. The WP is the only political party other than the PAP with elected Members of Parliament (MPs) since the 1991 general election.