The Isenach is a left tributary of the Rhine in the northeastern Palatine region of Rhineland-Palatinate. It is nearly 36 kilometres long.
The Isenach rises in the northern Palatinate Forest, 2 kilometres southwest of Carlsberg Hertlingshausen. Its source in the Diemerstein Forest on the southeast flank of a saddle between the peaks Krummes Eck, elevation 449 metres , and Hohe Bühl, elevation 444 metres , is marked with Ritterstein number 277, with the inscription "Isenach source". The first 5 kilometres of the river flow in a southeasterly direction. After the Isenach passes the Isenachweiher reservoir, it flows east through a valley it shares with Bundesstraße 37 Kaiserslautern-Bad Dürkheim.
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