Contemporary Izakaya & Japanese Dining Destination

Our restaurant, located on Mayfair’s prominent Grosvenor Street, is inspired by the nature-spirited roots and duality of Mount Fuji, honouring Japanese traditions and culinary craftsmanship.

Executive Chef Rhys Cattermoul showcases a broad spectrum of Japanese cuisine through delicate umami flavours and responsibly sourced ingredients.

Discover KOYN signatures alongside classic favourites from our sushi bar, robata and kitchen.

KOYN Series II: Festive Edition

Join us for the return of our inaugural Bar Residency series this winter! We play host to Barcelona’s legendary ‘Five-star dive bar’, Two Schmucks on the 30th of November, and pioneers of Milanese aperitivo, Camparino in Galleria, on the 13th of December.

Each bar will present exclusive cocktails exemplifying their approach to mixology.

Japanese Restaurant Mayfair Bar Residency Series Festive Edition

KOYN Bulletin

Stay up to date with what’s unfolding this festive season.

  • Japanese Restaurant London Mayfair Celebration Season Christmas Eve
    Christmas Eve at KOYN

    Enjoy live entertainment while indulging in our festive Christmas Hako.

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  • Japanese Restaurant London Mayfair New Year
    First Sunrise

    Celebrate New Year’s Eve with our curated seven-course tasting menu & bespoke cocktails.

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Cosmos Of KOYN

Split over two floors, discover three of our sophisticated dining rooms and izakaya-styled residential drinking den at our Grosvenor Street restaurant.

Our Story

Journey with us as we capture the complementary forces at play in Japan’s most majestic volcano
Journey with us as we capture the complementary forces at play in Japan’s most majestic volcano

Situated off Mayfair’s resplendent Grosvenor square, KOYN is housed in what was formerly both the US Embassy and Canadian High Commission at 38 Grosvenor Street.

Japanese Sushi Restaurant Best Mayfair



Monday to Sunday
Lunch: 12:00 - 14:30
Dinner: 17.30 - 22.45


Monday to Sunday
17:30 - 00:00