RheinEnergie can refer to:

• RheinEnergie AG, energy company based in Cologne
• RheinEnergieStadion, sports stadium in Cologne
• Köln 99ers, formerly RheinEnergie Köln, defunct basketball club

• Douglas Morton
• Douglas M. Sloan
• Douglas M. Stone (general)
• Douglas M. Thornton
• Douglas Mulholland
• Douglas Municipal Airport (disambiguation)
• Douglas Munson
• Douglas Murray (disambiguation)
• Douglas M. Webster
• Douglas N. Arnold
• Douglas Nation
• Douglas Navy Experimental Type D Flying Boat
• Douglas Navy Experimental Type D Transport
• Douglas Navy Type 0 Transport
• Douglas Navy Type D
• Douglas Navy Type D Transport
• Douglas Naysmith
• Douglas N. Daft AC
• Douglas Neame
• Douglas Neil Brodie
• Douglas, New Zealand (disambiguation)
• Douglas Nigel Marlette
• Douglas Nixon "Doug" Everingham
• Douglas Nixon Everingham
• Douglas N. Muir