Louis II Frederick Charles Eginhard, Count of Erbach-Fürstenau (12 May 1728 – 16 January 1794), was a member of the German House of Erbach who held the fiefs of Fürstenau, Michelstadt and Breuberg.
Born in Fürstenau, he was the fourth child and second (but eldest surviving) son of Philipp Charles, Count of Erbach-Fürstenau and his second wife Anna Sophie, a daughter of Kaspar, Baron of Spesshardt in Unsleben and Mupparg.
On 4 February 1784 Louis II married morganatically with Christine Sophie Küchler, his long-time mistress, who assumed the title of Frau von Treuberg.
[1] They had three sons, two of them was born before his parents' marriage:[2][better source needed] Louis II died in Heidelberg aged 65 and was buried in the Providenzkirche.
Because he died without legitimate issue, all his domains passed to the heirs of his brother George Albert III.