The Honourable Chamber of Deputies of the Republic of Chile is the lower house of Chile's bicameral (two-chambered) Congress. Its organisation and its powers and duties are defined in articles 42 to 59 of Chile's current constitution.

Deputies must: be aged at least 21; not be disqualified from voting; have finished secondary school or its equivalent; and have lived in the corresponding electoral district for at least two years prior to the election.

Currently, there are 155 members in the Lower House of the government.

Since 2017, Chile's congressional elections are governed by an Open list proportional representation. Proportional representation (PR) characterizes electoral systems in which divisions in an electorate are reflected proportionately in the elected body. If a given percentage of the electorate support a particular political party as their favourite, then roughly that same percentage of seats will be won by that party. The essence of such systems is that all votes contribute to the result—not just a plurality, or a bare majority.

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