Eyach may refer to:

• Eyach (Ammer), a river of Bavaria, Germany, tributary of the Ammer
• Eyach (Neckar), a river of Baden-Württemberg, Germany, tributary of the Neckar
• Eyach (Enz), a river of Baden-Württemberg, Germany, tributary of the Enz
• Eyach (Eutingen), a district of the town Eutingen im Gäu, Baden-Württemberg, Germany
• Eyach virus, a viral infection

This disambiguation page lists articles associated with the title Eyach.
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