Kaduwela electoral district was an electoral district of Sri Lanka between July 1977 and February 1989. The district was named after the town of Kaduwela in Colombo District, Western Province. The 1978 Constitution of Sri Lanka introduced proportional representation for electing members of Parliament. The existing 160 mainly single-member electoral districts were replaced with 22 multi-member electoral districts.[1] Kaduwela electoral district was replaced by the Colombo multi-member electoral district at the 1989 general elections, the first under proportional representation.