Dagmar Mühlenfeld is a German businessperson who has been the head of 6 different companies and presently is Chairman-Supervisory Board of Flughafen Essen Mülheim GmbH and Chairman-Supervisory Board at Ruhrbania Projektentwicklungsgesellschaft mbH.

She is also on the board of RWE AG, Sparkasse Muelheim an der Ruhr AöR and Beteiligungsholding Mülheim An der Ruhr GmbH.

In her past career Dagmar Mühlenfeld occupied the position of Chairman-Supervisory Board at RW Holding AG, Chairman-Supervisory Board of Mülheimer Wohnungsbau eG, Chairman-Supervisory Board for medl GmbH and Chairman-Supervisory Board for Mülheim & Business GmbH.