The Great Plan for the Transformation of Nature, also known as Stalin's plan for the transformation of nature, was proposed by Joseph Stalin in the Soviet Union in the second half of the 1940s, for land development, agricultural practices and water projects to improve agriculture in the nation. Its propaganda motto and catchphrase was “the great transformation of nature” (великое преобразование природы, velikoye preobrazovaniye prirody).
The plan was outlined in the Decree of the USSR Council of Ministers and All-Union Communist Party (Bolsheviks) Central Committee of October 20, 1948: "On the plan for planting of shelterbelts, introduction of grassland crop rotation and construction of ponds and reservoirs to ensure high crop yields in steppe and forest-steppe areas of the European USSR." It was a response to the widespread 1946 drought and subsequent 1947 famine, which led to estimated deaths of 500,000–1 million people.
A network of irrigation canals was built in the steppe belt of the southern Soviet Union, and in the deserts of Central Asia.
A project was proposed to plant trees in a gigantic network of shelterbelts (лесополоса, lesopolosa, "forest strip") across the steppes of the southern Soviet Union, similar to what had been done in the northern plains of the United States in the 1930s following drought and the extensive damage of the Dust Bowl years.