| Election Name: | June 1920 Zagreb local elections |
| Country: | Zagreb |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | March 1920 Zagreb local elections |
| Previous Year: | 1920 |
| Next Election: | 1921 Zagreb local elections |
| Next Year: | 1921 |
| Seats For Election: | 20 seats to the Zagreb City Assembly |
| Turnout: | 13.64% |
| Election Date: | 18 June 1920 |
| Candidate1: | Vjekoslav Heinzel |
| Party1: | Croatian Union |
| Popular Vote1: | 2,070 |
| Percentage1: | 65.16% |
| Colour1: | 727272 |
| Candidate2: | Vladimir Prebeg |
| Party2: | Party of Rights |
| Popular Vote2: | 766 |
| Percentage2: | 24.11% |
| Colour2: | 000000 |
| Mayor | |
| Before Election: | Dragutin Dončić |
| After Election: | Vjekoslav Heinzel |
| After Party: | Croatian Union |
On 18 June 1920 local elections were held in Zagreb, in the Kingdom of Serbs, Croats and Slovenes. The elections were held for the revoked mandates from last local elections in March 1920. The Croatian Union won a majority of seats and Vjekoslav Heinzel was named the new mayor of Zagreb.
| Political party | Votes | % | Seats | % | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Croatian Union Hrvatska zajednica | 2,070 | 65.16% | 13 | 65% | ||||||
| Croatian Party of Rights Hrvatska stranka prava | 766 | 24.11% | 5 | 25% | ||||||
| Croatian People's Peasant Party Hrvatska pučka seljačka stranka | 212 | 6.67% | 1 | 5% | ||||||
| People's Socialist Party Narodna socijalistička stranka | 129 | 4.06% | 1 | 5% | ||||||
| Total | align=center style="background: lightgrey" | 3,177 | align=center style="background: lightgrey" | 100% | align=center style="background: lightgrey" | 20 | align=center style="background: lightgrey" | 100% | ||
| Registered Voters/Turnout | align=center style="background: lightgrey" | 23,290 | align=center style="background: lightgrey" | 13.64% | ||||||
Democratic Party boycotted the elections and asked to schedule elections for the entire city assembly. The assembly after these elections had 28 members of the Croatian Union, 8 representatives of the Croatian Party of Rights, 5 from the Democratic Party, 5 from the Croatian People's Peasant Party, 1 from the Social Democratic Party, 2 representatives of Jewish parties and 1 socialist. On 17 August 17, 1920 Vjekoslav Heinzel was elected mayor with 27 votes, while Vladimir Prebeg from the Party of Rights received eight votes. Eight votes were invalid (blank ballots).[1]