Karl August Joseph Maria Donatus, Count of Seinsheim (17 February 1784 in Munich – 26 November 1864 in Munich) was the Bavarian Finance Minister and President of the Bavarian Chamber of Deputies (German: Präsident der Bayerischen Abgeordnetenkammer).

He was educated privately and then studied jurisprudence at the Universities of Landshut and Göttingen.

He then accompanied Ludwig, Crown Prince of Bavaria on a trip to Italy.

He was a member of the government councils of the administrative districts of the Etschkreis(Trento) in 1808, Regenkreis(Straubing) in 1809, Salzachkreis(Salzburg) in 1810, and Isarkreis(Munich) in 1817.

Since 1827, he was a member of the Bavarian Chamber of Deputies (German: der Bayerischen Abgeordnetenkammer), from which he retired 1846 after he served as its president from 1840 to 1843.