Cheng Lai-king (Chinese: 鄭麗琼, born 1959 or 1960) is a Hong Kong politician who served as District Councillor for the Castle Road constituency, and as former chairwoman of Central and Western District Council. She is a member of the Democratic Party and a registered social worker. She had held the seat since its creation in 1994 until her resignation from the District Council in July 2021. Her strongest electoral result was in 2003 when she secured 73.6% (1,625 votes), while in the 2019 elections she held the seat with 51.05% (2,669 votes).