German ostmark

{{for|the East German currency|East German mark}}

{{Infobox currency

| currency_name_in_local = {{native name|de|Ostmark}}
{{native name|pl|ostmarka}}
{{native name|et|idamark}}
{{native name|ru|остмарка|italics=no}}
{{native name|lt|ostmarkė}}|

| image_1 = Ostmark.jpg

| image_background_1 =

| image_title_1 =

| image_2 = Reverse Ostmark.jpg

| image_background_2 =

| image_title_2 =

| issuing_authority = {{lang|de|Darlehnskasse, Kowno}}

| date_of_introduction = 4 April 1918

| date_of_introduction_source =

| date_of_withdrawal = 1922

| using_countries = {{Plainlist}}

• {{flagicon|German Empire}} {{lang|de|Ober Ost}}
• {{flagicon|Courland}} Duchy of Courland and Semigallia
• {{flag|United Baltic Duchy}}

{{Endplainlist}}

| unofficial_users = {{Plainlist}}

• {{flag|Lithuania}} (1918–22)
• {{flag|Estonia}} (1918–19)

{{Endplainlist}}|

| subunit_ratio_1 = {{frac|1|100}}

| subunit_name_1 = {{native name|de|pfennig}}
{{native name|pl|fenig, fenigów}}
{{native name|lv|feniņš}}

| symbol = ℳ

| symbol_subunit_1 =

| plural_slavic =

| used_coins =

| used_banknotes = {{frac|1|2}}ℳ, 1ℳ, 2ℳ, 5ℳ, 20ℳ, 50ℳ, 100ℳ, 1,000ℳ

| obsolete = yes

| footnotes = Circulated alongside German ostrubel, with {{lang|de|2= 2 Ostmark = 1 Ostrubel}}

}}

{{lang|de|Ostmark|nocat=y}} ({{IPA|de|ˈɔstmaʁk|lang|De-Ostmark.oga}}) is the name given to a currency denominated in {{lang|de|Mark}} which was issued by Germany in 1918 for use in a part of the eastern areas under German control at that time, the {{lang|de|Ober Ost}} area. The currency consisted of paper money issued on 4 April 1918 by the {{lang|de|Darlehnskasse}} in {{lang|de|Kowno}} (Kaunas) and was equal to the German Papiermark. The {{lang|de|Ostmark}} circulated alongside the Imperial rouble and the {{lang|de|Ostrubel}}, with two {{lang|de|Ostmark}} equal to one {{lang|de|Ostrubel}}.