Arnold Friedrich Georg Diestel (2 March 1857 – 3 January 1924) was a German politician and a First Mayor of Hamburg. Diestel was born in Valparaíso, Chile and died in Hamburg.

Arnold Diestel
Arnold Diestel in Hamburg, 1905. Photograph by Rudolf Dührkoop
First Mayor of Hamburg and
President of the Hamburg Senate
In office
14 February 1920 – 31 December 1923
Preceded byFriedrich Sthamer
Succeeded byCarl Wilhelm Petersen
Personal details
Born2 March 1857
Valparaíso
Died3 January 1924 (1924-01-04) (aged 66)
Hamburg
NationalityGermany German
Political partyNonpartisan
Alma materAlbert Ludwig's University
Frederick William's University (Berlin)

In 1908 the Hamburg Parliament elected Diestel lifelong senator of Hamburg, replacing the late Johann Georg Mönckeberg. On 12 November 1918 the Hamburg revolutionary Soldiers' and Workers' Council deposed the Senate of Hamburg, but reappointed the senators as acting administration only on 18 November. In this function Diestel continued during the Weimar Republic, until the complete senate resigned on 27 March 1919, thus ending the life-term mandates under Hamburg's old 1860 constitution.

On 28–30 March 1919 the Hamburg Parliament, first time elected under equal suffrage by men and women of Hamburg, elected a new senate, into which Diestel and six more pre-war senators were reëlected, besides eleven new senators. Diestel was associated, but not a member of the German Democratic Party (Deutsche Demokratische Partei (DDP)). DDP and SPD had formed a coalition majority in the Hamburg Parliament. On 2 February 1920 the fellow senators elected Diestel their president and First Mayor of Hamburg, taking office after the announced resignation of Friedrich Sthamer, becoming ambassador. Diestel's term ended on 31 December 1923. The senate elected Carl Wilhelm Petersen his successor.

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