The title compound, [Ru(C5H7O2)2(C6H10)].1/6C2H6O, has a pseudo-octahedrally coordinated RuII center, where two coordination sites are occupied by a diene ligand. The diene ligand exhibits a eta 4-trans-diene coordination mode. The compound crystallizes in space group R3, incorporating disordered ethanol in cylindrical voids.