Potsdam I was one of the 35 electoral districts () used to elect members to the Reichstag during the Weimar Republic. It sent members to the Reichstag in nine democratic elections between 1919 and 1933. It existed nominally in the show elections to the Nazi Reichstag until 1938.

It comprised the northern suburbs of Berlin and most of the Regierungsbezirk Potsdam, the western part of Brandenburg. It was constituency 4 in the numbering scheme.

Electoral system The constituency was created for the January 1919 election. Under the proportional representation electoral system of the Weimar Republic, voters cast a vote for party lists. Parties were awarded a seat for every 60,000 votes in a constituency. Excess votes were aggregated at two higher levels of seat distribution: an intermediate level combining multiple constituencies, where extra seats were awarded to parties' constituency lists, and a national level where seats were awarded to national lists of each party or alliance.

Results (1919–1933) Vote share Party 1919 1920 1924 I 1924 II 1928 1930 1932 I 1932 II 1933 KPD 1.2 14.9 12.1 17.1 20.1 20.1 23.6 18.0 USPD 14.9 30.2 1.8 0.6 0.2 0.1 SPD 41.9 20.6 20.7 30.3 34.6 28.7 26.7 23.5 20.7 DDP 20.8 7.5 5.1 6.3 5.2 3.5 1.1 0.9 0.9 Centre 2.3 1.8 2.2 2.5 2.1 2.3 3.0 2.7 2.8 DVP 7.6 17.2 7.8 7.8 6.6 3.4 0.8 1.0 0.8 WP 4.4 4.8 5.0 4.1 0.4 0.2 DNVP 12.6 19.6 32.2 31.3 22.8 13.9 9.0 12.8 11.7 Nazi 5.8 2.8 1.7 18.8 38.1 34.1 44.4 Other 1.7 5.1 1.5 4.8 5.3 0.9 1.2 0.6 Turnout 84.9 82.6 78.9 79.8 78.5 83.3 85.0 82.5 89.2 Source: Wahlen in Deutschland

Deputies Election Distribution Seats 1919 10 1920 12 May 1924 12 Dec 1924 13 1928 14 1930 18 Jul 1932 19 Nov 1932 18 1933 19 Source: Wahlen in Deutschland

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