Ingeborg Kahlenberg

Ingeborg Luise Wallheimer Kahlenberg (Bremen, March 27, 1920 – New York, October 2, 1996) was a German-born photographer and member of the Dutch resistance during the Second World War. She was awarded the Resistance Memorial Cross (VHK), by Royal Dutch decree. She met , who taught her photography, while working for the Dutch Resistance They were both photographers for the resistance group ("the Underground or Hidden Camera"). The group filmed and photographed German activities and the famine and privations suffered by the Dutch, beginning in November 1944. It operated covertly, in violation of Nazi restrictions against photography outside domestic spaces in the Netherlands. Photographs taken by Ingeborg Wallheimer and Fritz Kahlenberg were instrumental in convincing the Red Cross to make food drops in Holland.

In addition to photography, Wallheimer's resistance activities included illegal communications, transporting armaments, and forgery.

The Jewish Museum in New York City featured an exhibition of work by members of the Hidden Camera group entitled The Illegal Camera: Photography in the Netherlands During the German Occupation, 1940–1945 in 1996. The Kahlenbergs died within two weeks of one another in October 1996, while the exhibition was on view.