In a bicameral Westminster System parliament, the House of Commons has traditionally been the name of the elected lower house. The Commons generally holds much more power than the upper house (the Senate or House of Lords). The leader of the majority party in the House of Commons usually becomes the prime minister. The existing Houses of Commons are:
- the British House of Commons (at the Palace of Westminster, London)
- the Canadian House of Commons (on Parliament Hill, Ottawa)
In other bicameral systems, the lower house may be known by one of the following names:
- House of Representatives - Australia, Jamaica, Trinidad and Tobago, Fiji
- House of Assembly - South Australia, Tasmania, Barbados, Swaziland, Bahamas, Bermuda
- House of Keys - Isle of Man
- Legislative Assembly - New South Wales, Victoria, Western Australia
- National Assembly - Pakistan, Lesotho, Namibia, South Africa
- House of the People - India Lok Sabha
- Chamber of Deputies - Argentina, Brazil, Chile, Italy, Mexico