He is married to Dorothea Luise von CRAMM.
They got married on June 6, 1775 at Sambleben, he was 32 years old.
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=159732775&pid=1286/ Ancestry.com
Ferdinand Anton von Krosigk<br>Gender: Male<br>Birth: Feb 5 1743 - Wolfenbüttel, Lower Saxony, Germany<br>Death: June 7 1805 - Gräfenhainichen, Saxony-Anhalt, Germany<br>Father: Heinrich von Krosigk<br>Mother: Charlotte Elisabeth von Krosigk (born von Miltitz)<br>Wife: <br>Children: Friedrich (Fritz) Freiherr von Krosigk, Dedo Freiherr von Krosigk, auf Poplitz, Laublingen, Mukrehna, Besedau, Benkendorf, Ludwig Franz von Krosigk, Anton Emil Freiherr von Krosigk, Anna Friedrike Charlotte von Trotha (born Freiin von Krosigk)
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=114784053&pid=4818