Nearly every country in the world has some form of parliament. Parliamentary systems fall into two categories: bicameral and unicameral. Out of 190 national parliaments in the world, 78 are bicameral (156 chambers) and 112 are unicameral, making a total of 268 chambers of parliament with some 44,000 members of parliament. IPU membership is made up of 180 national parliaments
The IPU has been collecting data on parliaments since its inception in 1889, including information on women’s participation in politics since 1945. In this section, discover the IPU's knowledge bank for and about parliaments.