The Krupp K5 was a heavy railway gun used by Germany through World War II. The K5 was the result of a crash program launched in the 1930s to develop a force of railway guns to support the Wehrmacht by 1939.

Production led to eight guns being in service for the Invasion of France, although problems were encountered with barrel splitting and rectified with changes to the rifling. The guns were then reliable until the end of the war, under the designation K5 Tiefzug 7 mm. Towards the end of the war, development was done to allow the K5 to fire rocket-assisted projectiles to increase range. Successful implementation was done for firing these from the K5Vz. A final experiment was to bore out two of the weapons to 310 mm smoothbore to allow firing of the Peenemünder Pfeilgeschosse arrow shells. The two modified weapons were designated K5 Glatt.

Anzio Annie was the name used by the Allies for a pair of German K5(E) railroad guns that shelled the Anzio beachhead during World War II. The Germans named them Robert and Leopold.

The guns were captured on 7 June 1944. Robert was partially destroyed by the gun crew before they surrendered and Leopold was also damaged but not as badly. Both guns were shipped to the U.S. Aberdeen Proving Ground, (Aberdeen, Maryland) where they underwent tests. One complete K5 was made from the two damaged ones, and Leopold remains on display to this day at the United States Army Ordnance Museum located on the Aberdeen grounds.

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