Mongolia uses a unicameral parliamentary system in which the president has a symbolic role and the government chosen by the legislature exercises executive power.

Government: Luxembourg is a hereditary Grand Duchy with a unicameral parliamentary system.

In the first years since its creation in post-independence India, the state of Andhra Pradesh worked under a unicameral parliamentary system.

The Constitutional Assembly emerged from the elections of 17 August 1928 with 58 members, a statute-sanctioned monarchical form of government and a unicameral parliamentary system.

A unicameral parliamentary system was introduced with the adaptation of the Democratic Socialist Republican Constitution of Sri Lanka in 1972.

While most of the nations of Western Europe had adopted bicameral parliaments by the end of the 19th century, in 1906 the Finns adopted a unicameral parliamentary system, and female citizens were included in universal suffrage.