The Internationales Stadionfest (ISTAF) is an annual track and field athletics meeting at the Olympic Stadium in Berlin, Germany.

Since 2006 ISTAF has been sponsored by DKB and officially known as the DKB-ISTAF and from 2010, had been part of the IAAF World Challenge, the second tier of global one day athletics events.

On 23 March 1937 the BSC, the Deutscher Sport-Club (DSC, later Olympischer Sport-Club OSC) and the SCC, agreed to hold international sports festivals together and organized the first meeting on 1 August 1937 at the Olympic Stadium, where the event is still held today.

The 2002 and 2003 ISTAF meetings were held at the Friedrich-Ludwig-Jahn-Sportpark instead, due to reconstruction of the Olympic Stadium in preparation for the 2006 FIFA World Cup.

When the Diamond League was conceived, it had been provisionally planned for Berlin to hold one of its meetings, but it was unable to meet the criteria set for the new elite series, therefore as from 2010, ISTAF became part of the second tier World Challenge circuit instead.