Ecklak is a municipality in the district of Steinburg, in Schleswig-Holstein, Germany.

Ecklak is located on the periphery of the Wilstermarsch and Kudenseemoor, about ten kilometers northeast of Brunsbüttel and 14 kilometers west of Itzehoe on the Kiel Canal. The federal highway 5 and the railway line from Itzehoe to Brunsbüttel run a few kilometers south of Ecklak. The river of Wilsterau flows through the municipality of Ecklak.