| Election Name: | 1958 Italian Senate election in Lombardy |
| Country: | Lombardy |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1953 Italian Senate election in Lombardy |
| Previous Year: | 1953 |
| Next Election: | 1963 Italian Senate election in Lombardy |
| Next Year: | 1963 |
| Seats For Election: | All 33 Lombard seats to the Italian Senate |
| Election Date: | May 25, 1958 |
| Leader1: | Amintore Fanfani |
| Party1: | Christian Democracy (Italy) |
| Last Election1: | 46.7%, 16 seats |
| Seats1: | 16 |
| Seat Change1: | = |
| Popular Vote1: | 1,805,779 |
| Percentage1: | 44.8% |
| Swing1: | 1.9% |
| Leader2: | Pietro Nenni |
| Party2: | Italian Socialist Party |
| Last Election2: | 17.4%, 6 seats |
| Seats2: | 7 |
| Seat Change2: | 1 |
| Popular Vote2: | 747,266 |
| Percentage2: | 18.5% |
| Swing2: | 1.1% |
| Leader3: | Palmiro Togliatti |
| Party3: | Italian Communist Party |
| Last Election3: | 18.2%, 6 seats |
| Seats3: | 6 |
| Seat Change3: | = |
| Popular Vote3: | 746,880 |
| Percentage3: | 18.5% |
| Swing3: | 0.3% |
| Old local majority | |
| Posttitle: | New local plurality |
| Before Election: | DC |
| After Election: | DC |
Lombardy elected its third delegation to the Italian Senate on May 25, 1958. This election was a part of national Italian general election of 1958 even if, according to the Italian Constitution, every senatorial challenge in each Region is a single and independent race.
Lombardy obtained two more seats to the Senate, following the redistricting subsequent to the 1951 Census.
The election was won by the centrist Christian Democracy, as it happened at national level. All Lombard provinces gave a majority or at least a plurality to the winning party.
Even if Amintore Fanfani's Christian Democracy weakened in this election, Lombardy remained a stronghold for the national leading party.
As it happened five years before, the Communists obtained some seats in the agricultural south, while the Socialists remarked their strength in the Milanese industrial neighbourhood. The centre-left Italian Democratic Socialist Party obtained two seats in Milan, a city led by Democratic Socialist mayor Virgilio Ferrari, while the rightist Italian Social Movement and the Italian Liberal Party obtained some good results in the bourgeois center of Milan.
The electoral system for the Senate was a strange hybrid which established a form of proportional representation into FPTP-like constituencies. A candidate needed a landslide victory of more than 65% of votes to obtain a direct mandate. All constituencies where this result was not reached entered into an at-large calculation based upon the D'Hondt method to distribute the seats between the parties, and candidates with the best percentages of suffrages inside their party list were elected.
|-|- bgcolor="#E9E9E9"!rowspan="1" align="left" valign="top"|Party!rowspan="1" align="center" valign="top"|votes!rowspan="1" align="center" valign="top"|votes (%)!rowspan="1" align="center" valign="top"|seats!rowspan="1" align="center" valign="top"|swing|-!align="left" valign="top"|Christian Democracy|valign="top"|1,805,779|valign="top"|44.8|valign="top"|16|valign="top"|=|-!align="left" valign="top"|Italian Socialist Party|valign="top"|747,266|valign="top"|18.5|valign="top"|7|valign="top"|1|-!align="left" valign="top"|Italian Communist Party|valign="top"|746,880|valign="top"|18.5|valign="top"|6|valign="top"|=|-!align="left" valign="top"|Italian Democratic Socialist Party|valign="top"|248,824|valign="top"|6.2|valign="top"|2|valign="top"|1|-!align="left" valign="top"|Italian Liberal Party|valign="top"|184,701|valign="top"|4.6|valign="top"|1|valign="top"|1|-!align="left" valign="top"|Italian Social Movement|valign="top"|151,330|valign="top"|3.8|valign="top"|1|valign="top"|=|-!align="left" valign="top"|Others & PNM|valign="top"|147,523|valign="top"|3.6|valign="top"|-|valign="top"|1|- bgcolor="#E9E9E9"!rowspan="1" align="left" valign="top"|Total parties!rowspan="1" align="right" valign="top"|4,032,303!rowspan="1" align="right" valign="top"|100.0!rowspan="1" align="right" valign="top"|33!rowspan="1" align="right" valign="top"|2|}
Sources: Italian Ministry of the Interior
|-|- bgcolor="#E9E9E9"!align="left" valign="top"|N°!align="center" valign="top"|Constituency!align="center" valign="top"|Elected!align="center" valign="top"|Party!align="center" valign="top"|Votes %!align="center" valign="top"|Others|-|align="left"|1|align="left"|Bergamo|align="left"|Cristoforo Pezzini|align="left"|Christian Democracy|align="left"|55.7%|align="left"||-|align="left"|2|align="left"|Clusone|align="left"|Pietro Bellora|align="left"|Christian Democracy|align="left"|67.4%|align="left"||-|align="left"|3|align="left"|Treviglio|align="left"|Daniele Turani|align="left"|Christian Democracy|align="left"|63.1%|align="left"||-|align="left"|4|align="left"|Brescia|align="left"|Angelo Buizza|align="left"|Christian Democracy|align="left"|46.7%|align="left"||-|align="left"|5|align="left"|Breno|align="left"|Angelo Cemmi|align="left"|Christian Democracy|align="left"|61.2%|align="left"||-|align="left"|6|align="left"|Chiari|align="left"|Pietro Cenini|align="left"|Christian Democracy|align="left"|59.1%|align="left"||-|align="left"|7|align="left"|Salò|align="left"|Francesco Zane|align="left"|Christian Democracy|align="left"|53.8%|align="left"||-|align="left"|8|align="left"|Como|align="left"|None elected|align="left"||align="left"||align="left"|Pasquale Valsecchi (DC) 45.9%|-|align="left"|9|align="left"|Lecco|align="left"|Pietro Amigoni|align="left"|Christian Democracy|align="left"|58.1%|align="left"||-|align="left"|10|align="left"|Cantù|align="left"|Lorenzo Spallino
Ugo Bonafini|align="left"|Christian Democracy
Italian Socialist Party|align="left"|56.4%
20.9%|align="left"||-|align="left"|11|align="left"|Cremona|align="left"|Bruno Gombi
Emilio Zanoni|align="left"|Italian Communist Party
Italian Socialist Party|align="left"|26.2%
21.3%|align="left"||-|align="left"|12|align="left"|Crema|align="left"|Ennio Zelioli|align="left"|Christian Democracy|align="left"|52.5%|align="left"||-|align="left"|13|align="left"|Mantua|align="left"|Alceo Negri|align="left"|Italian Socialist Party|align="left"|24.4%|align="left"|Ernesto Zanardi (PCI) 23.7%|-|align="left"|14|align="left"|Ostiglia|align="left"|Teodosio Aimoni
Unconstitutional result[1] |align="left"|Italian Communist Party
|align="left"|32.1%
24.8%|align="left"|
Seat ceded to Bonafini|-|align="left"|15|align="left"|Milan 1|align="left"|Giorgio Bergamasco|align="left"|Italian Liberal Party|align="left"|16.5%|align="left"||-|align="left"|16|align="left"|Milan 2|align="left"|Gastone Nencioni|align="left"|Italian Social Movement|align="left"|7.4%|align="left"||-|align="left"|17|align="left"|Milan 3|align="left"|Edgardo Savio|align="left"|Italian Democratic Socialist Party|align="left"|9.9%|align="left"||-|align="left"|18|align="left"|Milan 4|align="left"|Edgardo Lami Starnuti|align="left"|Italian Democratic Socialist Party|align="left"|9.9%|align="left"||-|align="left"|19|align="left"|Milan 5|align="left"|None elected|align="left"||align="left"||align="left"||-|align="left"|20|align="left"|Milan 6|align="left"|Piero Montagnani
Giuseppe Roda|align="left"|Italian Communist Party
Italian Socialist Party|align="left"|28.6%
23.8%|align="left"||-|align="left"|21|align="left"|Abbiategrasso|align="left"|None elected|align="left"||align="left"||align="left"|Emanuele Samek Lodovici (DC) 44.8%
Carlo Arnaudi (PSI) 20.7%|-|align="left"|22|align="left"|Rho|align="left"|Guido Corbellini
Arialdo Banfi|align="left"|Christian Democracy
Italian Socialist Party|align="left"|46.2%
20.9%|align="left"||-|align="left"|23|align="left"|Monza|align="left"|Gianmaria Cornaggia|align="left"|Christian Democracy|align="left"|48.9%|align="left"||-|align="left"|24|align="left"|Vimercate|align="left"|Cesare Merzagora|align="left"|Christian Democracy (Indep.)|align="left"|54.8%|align="left"||-|align="left"|25|align="left"|Lodi|align="left"|Francesco Scotti|align="left"|Italian Communist Party|align="left"|26.3%|align="left"||-|align="left"|26|align="left"|Pavia|align="left"|Pietro Vergani|align="left"|Italian Communist Party|align="left"|28.0%|align="left"|Giuseppe Faravelli (PSDI) 5.1%|-|align="left"|27|align="left"|Voghera|align="left"|None elected|align="left"||align="left"||align="left"||-|align="left"|28|align="left"|Vigevano|align="left"|Carlo Lombardi|align="left"|Italian Communist Party|align="left"|36.0%|align="left"||-|align="left"|29|align="left"|Sondrio|align="left"|Attilio Piccioni|align="left"|Christian Democracy|align="left"|57.7%|align="left"||-|align="left"|30|align="left"|Varese|align="left"|Noè Pajetta
Antonio Greppi|align="left"|Christian Democracy
Italian Socialist Party|align="left"|45.5%
21.5%|align="left"||-|align="left"|31|align="left"|Busto Arsizio|align="left"|Natale Santero
Mario Grampa|align="left"|Christian Democracy
Italian Socialist Party|align="left"|47.8%
22.9%|align="left"||}