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1840 Portuguese legislative election
142 seats to the Chamber of Deputies; 72 seats needed for a majority
Prime Minister before election; 1st Count of Bonfim; Septembrism	Elected Prime Minister ; 1st Count of Bonfim; Septembrism

Parliamentary elections were held in Portugal on 22 March 1840.^[1]

Electoral system

The elections were held under the 1838 constitution,^[1] which provided for a bicameral parliament with a directly-elected Senate (replacing the appointed Chamber of Most Worthy Peers) and Chamber of Deputies.^[2] Voting was restricted to men over the age of 25 and income of at least 80,000 reals, although members of religious orders, servants, vagabonds and those still dependent on their parents were barred from voting.^[2] The voting age was reduced to 20 for men who were married, serving in the military, had graduated from university or were part of the secular clergy.^[2] Candidates for the Chamber were required to have a net income of over 400,000 reals, and at least half of those elected in each constituency were required to have been born in the area or have lived in it for at least a year.^[2] Candidates for the Senate needed to be at least 35 years old and had a higher income threshold, but were not required to have a geographic link to their constituency.^[2]

Members of the Chamber of Deputies were elected from 28 multi-member constituencies with between 2 and 15 seats.^[2] The elections were held using a two-round system, with candidates required to receive a majority of the vote to be elected in the first round, before a second round (which was limited to a number of candidates equalling three times the number of seats remaining to be filled) was carried out on a plurality basis.^[2]