In the course of our screening program for repellents against the blue mussel, Mytilus edulis, from plant extracts, the methanol extract of Eucalyptus resinifera was found to exhibit remarkable repellent activity. We now report the isolation and structure of novel monoterpene flavonol glycosides, designated as resinosides A (1) and B (2), with repellent activity. Resinoside A (1) was a 1:1 anomeric mixture at the C-4''' position, with C-7 of oleuropeic acid linked to C-6'' of the glucosyl moiety of astragalin through an ester bond. Resinoside B (2) had oleuropeic acid connected through an ester linkage to the C-6'' hydroxyl of the galactose moiety. Resinoside A (1) exhibited repellent activity at 0.78 pmol/cm2 (unit*1 64 eq.) against the blue mussel, M. edulis, which was much more active than its components (kaempferol, astragalin, oleuropeic acid) or their mixture, indicating that the structure of 1 was important to exhibit repellent activity.