The Reichsmark (sign: ℛℳ) was the currency in Germany from 1924 until 20 June 1948 in West Germany, where it was replaced with the Deutsche Mark, and until the 23 June in East Germany when it was replaced by the East German mark. The Reichsmark was subdivided into 100 Reichspfennig. The Mark is an ancient Germanic weight measure, traditionally a half pound, later used for several coins. From 1871 to 1918 Germany was called the Kaiserreich, or the Deutsches Reich. Although Germany became a republic in 1919, the term "Reich" remained part of the country's official name.

The Reichsmark was introduced in 1924 as a permanent replacement for the Papiermark. This was necessary due to the 1920s German inflation which had reached its peak in 1923. The exchange rate between the old Papiermark and the Reichsmark was 1 ℛℳ = 1012 Papiermark (one trillion in US English and French, one billion in German and other European languages and UK English of the time, see long and short scales). To stabilize the economy and to smooth the transition, the Papiermark was not directly replaced by the Reichsmark, but by the Rentenmark, an interim currency backed by the Deutsche Rentenbank, owning industrial and agricultural real estate assets. The Reichsmark was put on the gold standard at the rate previously used by the Goldmark, with the U.S. dollar worth 4.2 ℛℳ.

With the unification of Germany and Austria in 1938, the Reichsmark replaced the Schilling in Austria. During the Second World War, Germany established fixed exchange rates between the Reichsmark and the currencies of the occupied and allied countries, often set so as to give the Germans economic benefits.

The first Reichsmark banknotes were introduced by the Reichsbank and state banks such as those of Bavaria, Saxony and Baden. The first Reichsbank issue of 1924 came in denominations of 10, 20, 50, 100, and 1000 Reichsmark. This was followed by a second issue in the same denominations, dated between 1929 and 1936. A 20 Reichsmark note was introduced in 1939, using a design taken from an unissued Austrian 100 schilling banknote type. Five Reichsmark notes were issued in 1942. Throughout this period, the Rentenbank also issued banknotes denominated in Rentenmark, mostly in low denominations.

In preparation for the occupation of Germany, the United States issued occupation banknotes dated 1944, printed by the Forbes Company of Boston. These were printed in similar colours with different sizes for groups of denominations. Notes were issued for ½, 1, 5, 10, 20, 50, 100, and 1000 Mark (not Reichsmark). The issuer was the Alliierte Militärbehörde ("Allied military authorities") with In Umlauf gesetzt in Deutschland ("in legal circulation in Germany") printed on the obverse.

The Soviet Union demanded copies of the engraving plates, ink, and associated equipment in early 1944, and on 14 April 1944 Henry Morgenthau and Harry Dexter White of the U.S. Treasury Department authorized the immediate air transfer of these to the USSR. Using a printing plant in occupied Leipzig, the Soviet authorities printed large runs of occupation marks. Since these were convertible to U.S. dollars at a rate of 10:1, the exercise financed the Soviet occupation while causing inflation and financial instability. An investigation by the United States Congress (Occupation Currency Transactions Hearings before the Committee on Appropriations, Armed Services and Banking and Currency, U.S. Senate, 1947) found that about $380,000,000 "more currency than there were appropriations for" had been circulated.

In 1947 Rhineland-Palatinate issued 5 and 10 Pfennig notes with Geldschein on them.

Coins and banknotes for circulation in the occupied territories during the war were issued by the Reichskreditkassen. Holed, zinc coins in 5 and 10 Reichspfennig denominations were struck in 1940 and 1941. Banknotes were issued between 1939 and 1945 in denominations of 50 Reichspfennig, 1, 2, 5, 20, and 50 Reichsmark. These served as legal tender alongside the currency of the occupied countries.

The coins were originally planned in great numbers of 100 million and 250 million, Rpf 5 and 10 Rpf respectively. The first embossing order, which was issued in April 1940, was about 40 million 5 Rpf and 100 million 10 Rpf. The total amount was divided between each of the seven German mints after the embossing key of 1939. The contract was stopped in August 1940 as the Wehrmacht, which had requested the coins for Belgium and France, had no more need of it. When the embossing stopped, only Berlin ("A") and Munich ("D") produced significant quantities, but they still came to only a small extent of original production plans. The majority were melted down due to the limited supply of metal and thus, most mint marks are now quite rare (except for 1940 5 A and D, and 1940 10 A).