The County of Rieneck was a comital domain within the Holy Roman Empire that lay in what is now northwestern Bavaria (in the west of Lower Franconia).

[1] From 1295, Lohr am Main became the seat of the burgraviate and border posts were set up to shelter the local castle from the domains of the archbishopric.

[1] In 1333, the county was granted city rights by Louis IV the Bavarian, Holy Roman Emperor, as thanks for support during his struggle for the kingdom.

[1] Skillful dynastic marriages allowed for the gradual expansion of their domain; conflict often resulted between Rieneck and their neighbors, the Archbishopric of Mainz and the Bishopric of Würzburg.

In 1815, the county – then a part of the Grand Duchy of Frankfurt – was granted to the Kingdom of Bavaria by the Congress of Vienna.