Isenburg-Büdingen was a County of southern Hesse, Germany, located in Büdingen.
It was partitioned between itself, Isenburg-Meerholz and Isenburg-Wächtersbach in 1673, and was mediatised to Isenburg in 1806.
In 1816 Isenburg was partitioned between the Grand Duchy of Hesse-Darmstadt and the Electorate of Hesse-Kassel.
Count Ernest Casimir (1801-1848) was elevated to the rank of prince by Louis II, Grand Duke of Hesse, in 1840.
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