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KOYN Japanese, London, Greater London

KOYN Japanese

4.5
4.5
253 Reviews
£41 and over
Japanese

Make a booking

2 people
21:00
Booked 14 times today
Experiences are available.

About this restaurant

  • Good for special occasions
  • Charming
  • Good for business meals
A multifaceted Asian dining destination in the heart of Mayfair. Discover our contemporary Japanese dining and our Izakaya style KOYN bar.

KOYN Japanese is located on our ground floor of Mayfair's Grosvenor Square and is a celebration of the timeless artistry of Japanese cuisine elevated by a contemporary approach.
The kitchen led by Executive Chef Rhys Cattermoul presents a menu highlighting the true essence of each ingredient, guided by a philosophy that embraces innovation while respecting tradition, to showcase the broad spectrum of Japanese cuisine through rich umami flavours and locally sourced produce.

KOYN's philosophy places value on subtlety and detail through an amalgamative lens where art, design, and textile traditions meet culinary craftsmanship.

Dining areas

Additional information

Experiences

  • Sushi Omakase Experience

    £108.00 per person

    Multiple dates available
    A curated Omakase experience to be enjoyed at our elegant sushi counter. LOBSTER AVOCADO SENBEI yuzu truffle miso WHITE FISH NIGIRI SALMON creamy spicy Aburi NASU KARASHI SU MISO UNAGI KINOME NIGIRI KING CRAB NIGIRI EBI NIGIRI SABA, SHIRO KONBU NIGIRI TORO CAVIAR NIGIRI WAGYU NIGIRI truffle MINI CHILEAN SEABASS shiso salsa verde PASSION FRUIT PANNA COTTA coconut sorbet, ginger crumble £108pp
    Sushi Omakase Experience photo

Menu

View menu on restaurant's website

What 253 people are saying

KOYN Japanese reviews from people who’ve dined at this restaurant. Based on recent rating.

Overall ratings and reviews

Reviews can only be made by diners who have eaten at this restaurant

4.5
4.5 based on recent ratings
  • 4.6Food
  • 4.5Service
  • 4.4Ambience
  • 4.1Value

Noise • Moderate

Review summary

AI-generated from verified diner reviews
KOYN Japanese in Mayfair offers an exceptional dining experience with "impeccable ingredients and ingenious Asian recipes." Guests rave about the "amazing food and impeccable service," with standout dishes like the black cod and sushi rolls. While some find it "very pricey," the ambiance and attentive staff make it worth the visit.

253 Reviews

  1. Jan

    London1 review

    4.0

    Dined 4 days ago

    1. Overall 4
    2. Food 5
    3. Service 5
    4. Ambience 5
    Food was amazing. Staff were very knowledgeable about the products on offer as well as pairings for drinks and food. The overall experience was delightful. We did book this as a celebration but unfortunately did not hear anything regarding it. Also almost every meal was 3 portions (there were 3 of us) but at the end the portions were reduced to 2 for some reason.

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  2. Fintan

    Cambridge1 review

    1.0

    Dined 5 days ago

    1. Overall 1
    2. Food 2
    3. Service 1
    4. Ambience 1
    This was a really poor dining experience. My partner and I had the tasting menu costing £200 for us both, and to say we feel ripped off is an understatement. We were waiting 20 minutes between each dish. When our different dishes arrived we were not told what they were. The food tasted okay, but it was nothing to write home about. Our bad dining experience was topped off when one small chocolate fondant arrived with a tiny piece of ice cream and we had to share this. (Picture attached). Without doubt the worst value I've had in London. The food took an age, the beer was warm and there were empty glasses and bottles left on our table. It should be said that including ourselves there was a total of 7 people dining in the entire restaurant. We paid £250 in total, but there was zero substance or satisfaction.

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  3. Kulbir VIP

    London1 review

    5.0

    Dined on 6 March 2025

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Excellent as always. Amazing food and service. Highly recommended

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  4. peter

    London2 reviews

    5.0

    Dined on 21 February 2025

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Amazing night, fantastic and friendly service, great Sommelier. The food was perfect. Thanks.

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  5. Georgy

    London1 review

    4.0

    Dined on 14 February 2025

    1. Overall 4
    2. Food 5
    3. Service 5
    4. Ambience 4
    Excellent food and service! Ambience was pleasant but nothing super special, and so good but not outstanding value for money.

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  6. Aaron

    London4 reviews

    5.0

    Dined on 13 February 2025

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Fantastic restaurant. Amazing food and great service! Definitely be going again!

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  7. Dean

    London1 review

    2.0

    Dined on 22 January 2025

    1. Overall 2
    2. Food 3
    3. Service 1
    4. Ambience 2
    Not a great experience. Staff were disorganised from the point of arrival. We had to ask three times for the drinks we had ordered, staff also knew very little about the food being delivered to our table. Food was distinctly average. Pretty disappointing all round.

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  8. Cevdet

    Washington DC10 reviews

    3.0

    Dined on 16 January 2025

    1. Overall 3
    2. Food 3
    3. Service 3
    4. Ambience 3
    Sushi quality was OK but below my expectation and overpriced

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  9. JAMES

    Northampton3 reviews

    5.0

    Dined on 11 January 2025

    1. Overall 5
    2. Food 5
    3. Service 4
    4. Ambience 4
    Fantastic food, we were the first on the new counter omakase set menu, could have been slowed down just a little, we were in and out in 45 mins and would have loved to spend longer enjoying the experience and try more cocktails.

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  10. Barbara

    London1 review

    4.0

    Dined on 9 January 2025

    1. Overall 4
    2. Food 5
    3. Service 5
    4. Ambience 4
    Excellent food and very friendly and attentive service.

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FAQs

KOYN Japanese offers takeout which you can order by calling the restaurant at 020 3535 2000.

KOYN Japanese is rated 4.5 stars by 253 OpenTable diners.

Yes, you can generally book this restaurant by choosing the date, time and party size on OpenTable.

Make a booking

2 people
21:00
Booked 14 times today
Experiences are available.
Google Map for KOYN Japanese

38 Grosvenor St, London, Greater London W1K 4QX

Dining areas

Additional information

  • Phone number
    020 3535 2000
  • Price
    £41 and over
  • Cuisines
    Japanese
  • Hours of Operation
    Lunch Tue–Sat 12:00–14:30 Dinner Mon–Sat 17:30–22:30 Sun 17:30–21:30
  • Dress code
    Smart Casual
  • Parking details
    Street Parking
  • Payment Options
    AMEX, Mastercard, Visa
  • Executive Chef
    Rhys Cattermoul
  • Delivery & takeout
    Order direct
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