The gulden, divided into 100 Pfennige, was the currency of the Free City of Danzig from 1923 to 1939.

From 1914 to 1923, Danzig used the German Papiermark and issued several local 'emergency notes'. Inflation during 1922–23 averaged roughly 2,440% per month.^[1] In July 1923 it was announced that a new and independent currency (the gulden) was being established with the approval of the League of Nations finance committee to replace the German mark.^[2] The gulden was introduced at a value of 25 gulden = 1 pound sterling.^[2][3]

The first series of coins was issued in 1923, followed by a second in 1932. Coins were issued in denominations of 1, 2, 5 and 10 pfennige and 1⁄2, 1, 2, 5, 10 and 25 gulden.

The 25-gulden coins were minted in gold. Produced in very small numbers in 1923 (1,000) and 1930 (4,000), the latter date's issue was only released as a few presentation pieces. As part of the 1923 series are 200 proof coins and, while available to collectors, are very expensive.^[8] The 1930 issue was essentially unobtainable until a large number appeared in the 1990s, apparently released from a Russian treasury where they had been stored since their capture at the end of World War II.^[9]

The first Danzig gulden banknotes were issued by the Danzig Central Finance Department and dated 22 October 1923 with a second issue dated 1 November 1923.^[13] Denominations for both series included 1, 2, 5, 10, 25, and 50-pfennige notes,^[13] as well as 1, 2, and 5 gulden.^[13] In addition, the first issue contained 10 and 25-gulden notes,^[14] and the second issue contained 50 and 100-gulden notes.^[15] The Bank of Danzig was capitalized with £300,000 on 5 February 1924 and officially opened on 17 March 1924.^[3] The Bank of Danzig issued four series of gulden (1924, 1928–30, 1931–32, and 1937–38) with an initial issue date of 10 February 1924.^[15]