Douglas Lake or Lake Douglas is the name of several different lakes:
United States Douglas Lake (Alabama) Douglas Lake (Alaska) Douglas Lake (Georgia) Douglas Lake (Illinois) Douglas Lake (Kansas) Douglas Lake (Kentucky) Douglas Lake (Cheboygan County, Michigan) Douglas Lake (Otsego County, Michigan), Otsego County, Michigan Douglas Lake (Minnesota) Douglas Lake (Clay County, Mississippi), Clay County, Mississippi Douglas Lake (Lafayette County, Mississippi), Lafayette County, Mississippi Douglas Lake (Missouri) Douglas Lake (North Dakota) Douglas Lake (Oregon) Douglas Lake, Tennessee Douglas Lake (West Virginia) Douglas Lake (Wisconsin) Lake Douglas (Lake County, Florida), Lake County, Florida Lake Douglas (Orange County, Florida), Orange County, Florida Lake Douglas (Georgia) Lake Douglas (Montana) Lake Douglas (South Dakota)
Canada Douglas Lake, British Columbia - see Douglas Lake Airport Douglas Lake, Northwest Territories
New Zealand Douglas Lake (New Zealand), glacial lake at the terminus of the Douglas Glacier