KOYN Japanese

Name: KOYN Japanese
Address: 38 Grosvenor St, London, Greater London, United Kingdom, W1K 4QX
Telephone: 020 3535 2000
Price range: £41 and over
Rating: 4.4

4.4 (260)

£41 and over

Japanese

38 Grosvenor St, London, Greater London W1K 4QX

Make a reservation

2 people

Jun 26, 2025

7:00 PM

Booked 15 times today

Experiences are available.

About this restaurant

Good for special occasions
Good for business meals
Charming

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

Dining style
Fine Dining
Price
£41 and over
Cuisines
Japanese
Hours of operation
Lunch Tue–Sat 12:00 pm–2:30 pm Dinner Mon–Sat 5:30 pm–10:30 pm Sun 5:30 pm–9:30 pm
Phone number
020 3535 2000
Website
http://www.koynrestaurants.com/
Payment options
AMEX, Mastercard, Visa
Dress code
Smart Casual
Executive chef
Rhys Cattermoul
Catering
Kindly note we do not offer outdoor catering.
Private party facilities
Please contact the restaurant directly on 020 3535 2000 or reservations@koynrestaurants.com for further information.
Delivery & takeout
Order direct

Location
38 Grosvenor St, London, Greater London W1K 4QX
Neighborhood
Mayfair
Cross street
Grosvenor Square
Parking details
Street Parking
Public transit
Nearest Tube Station is Bond Street (Davies Street and turn right on Grosvenor Street)
Additional
Banquet, Bar/Lounge, Beer, Cocktails, Counter Seating, Delivery, Full Bar, Gluten-free Options, Non-Smoking, Private Room, Takeout, Vegan, Wheelchair Access, Wine

Experiences

London Restaurant Festival: Taste Of KOYN
£78.00 per person
Jun 1, 2025 - Jun 30, 2025
TASTE OF KOYN TUNA SENBEI yuzu chili miso YELLOWTAIL truffle soy KOYN SALAD green leaves, seasonal vegetables KOYN SUSHI SELECTION Imperial Oscietra Caviar (8 grams) + 40pp ROCK SHRIMP TEMPURA spicy citrus honey CHILEAN SEABASS wasabi shiso salsa verde YUZU MERINGUE TART yuzu, raspberry
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

What 260 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

4.4

4.4 based on recent ratings

4.4Food
4.4Service
4.3Ambience
4.0Value

Noise • Moderate

Loved For

West End London
Romantic

Review summary

AI-generated from verified diner reviews

KOYN Japanese offers an exceptional dining experience in the heart of Mayfair with "amazing food and service." Guests rave about the "unbelievable" Chilean Sea bass and expertly crafted cocktails. The ambiance is vibrant, and the staff attentive, making it a "highly recommended" destination for sushi enthusiasts and Japanese cuisine lovers alike.

260 Reviews

M
Morgane
London1 review
2.0
Dined on June 18, 2025
1. Overall 2
2. Food 2
3. Service 3
4. Ambience 3
Too many food for the price... We ordered taste of KOYN and we were surprised to share everything (even de desert).
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E
Eian
London1 review
2.0
Dined on May 14, 2025
1. Overall 2
2. Food 3
3. Service 2
4. Ambience 4
The chefs did not made the omakase the experience as it should be. The sake is mid, the first course the senbei hurts my mouth, honestly would not recommend. Some of the dishes r nice yet the service was really disappointing, with little explanation nor attentiveness.
1 person found this helpful
Y
Yi-Ting
London1 review
2.0
Dined on May 11, 2025
1. Overall 2
2. Food 2
3. Service 4
4. Ambience 3
I received a voucher to visit this restaurant as a birthday gift. Unfortunately, the overall experience was disappointing. While the food was generally good—though a couple of dishes were a bit salty for my taste, which may just be personal preference—the quality and taste didn’t justify the high prices. The ambiance was pleasant, but overall, I wouldn’t recommend this restaurant based on my experience.
1 person found this helpful
s
sophia VIP
London12 reviews
5.0
Dined on May 9, 2025
1. Overall 5
2. Food 5
3. Service 5
4. Ambience 5
Absolutely outstanding food and service; the sushi was delicious I especially loved the yellowtail with truffle. The Chilean Sea bass with shiso salsa verde and the Napa cabbage with koji dressing were unbelievable. Fantastic dining experience, highly recommended!
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R
Rasmus VIP
Hamburg14 reviews
3.0
Dined on May 2, 2025
1. Overall 3
2. Food 3
3. Service 1
4. Ambience 3
Lack of service from Indian staff - too focused on “a specific” table missing the attention to details on the order. Not a friendly catering. Lady taking over were friendly. Food OK but not over the moon. Some courses a bid bland in taste and tempura prawns were soft.
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C
Christian
London1 review
5.0
Dined on April 20, 2025
1. Overall 5
2. Food 5
3. Service 5
4. Ambience 4
Best food I've had the pleasure to eat in London, the Nasu was to die for!
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J
JJ
London4 reviews
4.0
Dined on March 29, 2025
1. Overall 4
2. Food 4
3. Service 4
4. Ambience 4
Lovely food and great ambience. The toro, spiced tuna, slow cooked beef gohan, and napa cabbage are our clear favourites!
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J
Jan
London1 review
4.0
Dined on March 10, 2025
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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F
Fintan
Cambridge/Cambridgeshire1 review
1.0
Dined on March 9, 2025
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.
1 person found this helpful
K
Kulbir VIP
London1 review
5.0
Dined on March 6, 2025
1. Overall 5
2. Food 5
3. Service 5
4. Ambience 5
Excellent as always. Amazing food and service. Highly recommended
Is this helpful?

FAQs

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

KOYN Japanese is rated 4.4 stars by 260 OpenTable diners.

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

Make a reservation

2 people

Jun 26, 2025

7:00 PM

Booked 15 times today

Experiences are available.

38 Grosvenor St, London, Greater London W1K 4QX

Dining areas

Additional information

Cross street
Grosvenor Square
Neighborhood
Mayfair
Hours of operation
Lunch Tue–Sat 12:00 pm–2:30 pm Dinner Mon–Sat 5:30 pm–10:30 pm Sun 5:30 pm–9:30 pm
Price
£41 and over
Cuisines
Japanese
Dining style
Fine Dining
Dress code
Smart Casual
Parking details
Street Parking
Public transit
Nearest Tube Station is Bond Street (Davies Street and turn right on Grosvenor Street)
Payment options
AMEX, Mastercard, Visa
Executive chef
Rhys Cattermoul
Additional
Banquet, Bar/Lounge, Beer, Cocktails, Counter Seating, Delivery, Full Bar, Gluten-free Options, Non-Smoking, Private Room, Takeout, Vegan, Wheelchair Access, Wine
Delivery & takeout
Order direct

Website
http://www.koynrestaurants.com/
Phone number
020 3535 2000
Catering
Kindly note we do not offer outdoor catering.
Private party facilities
Please contact the restaurant directly on 020 3535 2000 or reservations@koynrestaurants.com for further information.

KOYN Japanese

Make a reservation

About this restaurant

Dining areas

Additional information

Experiences

London Restaurant Festival: Taste Of KOYN

Sushi Omakase Experience

Menu

What 260 people are saying

Overall ratings and reviews

Loved For

Review summary

FAQs

Does KOYN Japanese offer delivery through OpenTable or takeout?

How is KOYN Japanese restaurant rated?

Is KOYN Japanese currently accepting reservations?

Make a reservation

Dining areas

Additional information