Mechthild of Schwarzburg-Käfernburg (died 1192), was a countess consort of Holstein by marriage to Adolf II of Holstein.Heinz Maybaum (1953), "Adolf III., Graf von Holstein", Neue Deutsche Biographie (in German), vol. 1, Berlin: Duncker & Humblot She was the regent of Holstein during the minority of her son Adolf III of Holstein between 1164 and 1174.
She was born to Count Sizzo III of Schwarzburg-Käfernburg.Genealogie Graf von Holstein-Wagrien am 14.1.2007
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