'Stein' (i) was a German unrealised plan within 'Gelb' for the amphibious force of Kapitänleutnant Stein’s Sonderkommando 'Stein' to take and hold the Dutch islands of the West Frisian group from any forces which might be holding them (November 1939/May 1940).

The plan was later used as the German forces moved to occupy these islands after the surrender of the Netherlands.