A morgen was a unit of measurement of land area in Germany, the Netherlands, Poland and the Dutch colonies, including South Africa and Taiwan. The size of a morgen varies from to  acres, which equals approximately 0.2 to 1 hectare. It was also used in old Prussia, in the Balkans, Norway and Denmark, where it was equal to about two-thirds of an acre (0.27 ha).

"Morgen!" ("Tomorrow!") is the last in a set of four songs composed in 1894 by the German composer Richard Strauss. It is designated Opus 27, Number 4.