Alster (disambiguation)

Alster is a tributary of the Elbe river in Northern Germany.

Alster may also refer to:


 * Alster (Itz), a river of Bavaria and Thuringia, Germany, tributary of the Itz
 * Alster, Sweden, a locality in Värmland County, Sweden
 * Der Club an der Alster, a German sports club in Hamburg
 * German auxiliary Alster (A50) (1988), an intelligence ship of the German Navy
 * Mathilda Alster, a fictitious character in the Japanese manga Beyblade
 * a Shandy with lemonade called Alster in northern Germany
 * SS Alster, a number of steamships