Restaurant in Vienna, Austria
Cathedral views, Modern European cooking, worth booking.
ONYX holds two consecutive Michelin Plates (2024–2025) and sits directly on Stephansplatz with cathedral views. Chef Ádám Mészáros works a Modern European and Asian format at €€€ pricing — a tier below Vienna's starred elite but with genuine ambition. Book two to three weeks out for weekends. A sound choice for groups or occasion dining where the address matters as much as the plate.
ONYX sits at Stephansplatz 12, one of the most charged addresses in Vienna, with St. Stephen's Cathedral visible from its position in the Haas Haus building. That location alone would be enough to fill seats. The fact that it holds two consecutive Michelin Plates (2024 and 2025) and a 4.1 Google rating across more than 1,400 reviews suggests it is earning its bookings rather than coasting on the view. For a food-focused traveller who wants serious Modern European cooking with Asian inflections, a memorable room, and a price point that sits a tier below Vienna's starred elite, ONYX is worth booking. Go in with calibrated expectations: this is Michelin-recognised, not Michelin-starred, and the €€€ pricing reflects that gap honestly.
The visual impact starts before the food arrives. The Haas Haus is a Hans Hollein-designed building from 1990, its curved glass facade a deliberate architectural counterpoint to the Gothic mass of the Stephansdom across the square. ONYX occupies the upper floor, and the sightline to the cathedral is the kind of thing that makes first-time visitors pause. For travellers coming from cities where fine dining means a basement or a converted warehouse, this is a different register entirely — the room does real work.
Chef Ádám Mészáros brings a Modern European framework with consistent Asian technique threads running through it. That combination is familiar in ambitious European restaurants right now, but the execution here carries enough discipline to hold the Michelin Plate recognition across two consecutive years, which is a meaningful signal. The Plate designation means the inspectors found cooking worth recommending, even if it did not yet meet the standard for a star. For the explorer who has worked through Vienna's starred rooms and wants to see what is moving up the rankings, ONYX is a logical next booking. For a first-time visitor to Vienna's fine dining scene, it is a lower-stakes entry point than the city's €€€€ tier without sacrificing ambition.
The Modern European and Asian fusion format is well-suited to groups with mixed preferences. Where a more austere tasting menu at somewhere like Konstantin Filippou demands full table commitment to a single direction, ONYX's format tends to offer enough range that different palates at the same table find something that works for them. That flexibility matters more than it might seem when you are organising a group dinner around a business itinerary or a multi-generational family booking.
For groups, the location at Stephansplatz 12 provides an inherent convenience that is easy to undervalue: it is central enough that attendees arriving from different parts of Vienna or from hotels across the first district can reach it without coordination headaches. Private dining at a venue with this kind of landmark address also carries a presentational weight that matters for corporate or celebratory bookings. The phone and full booking details are not publicly listed in Pearl's current data, so contacting the venue directly to discuss private room availability and group menus is the right first step. Given the €€€ price positioning, group dining here costs less per head than equivalent experiences at Mraz & Sohn or Steirereck im Stadtpark, which makes it a more defensible choice when you are covering a table of eight rather than two.
The 4.1 rating across 1,465 Google reviews is a useful cross-check here. A high-volume review base at that score typically indicates consistent delivery across a broad range of guests and occasions, including groups and occasion diners who are harder to satisfy than regulars. It is not a perfect proxy for fine dining quality, but it does suggest the kitchen and front of house are handling volume and variety without significant lapses.
Vienna has a deep and varied fine dining programme. If you are building an itinerary around eating seriously, ONYX pairs well with a broader exploration of the city's restaurant scene. For context on what else is available, the Pearl Vienna restaurants guide covers the full competitive set. Within Austria more broadly, standout destinations like Ikarus in Salzburg, Döllerer in Golling an der Salzach, and Griggeler Stuba in Lech show how the country's kitchen talent spreads well beyond the capital. In Vienna itself, Amador and Doubek are worth knowing as nearby alternatives in the creative European register. For international points of comparison in the Modern European and Asian fusion space, Atomix in New York City represents what that combination looks like at its most technically demanding, giving useful context for where ONYX sits in the global spectrum.
If you are also planning accommodation and want to situate ONYX within a broader Vienna trip, the Pearl Vienna hotels guide is the logical complement. The Vienna bars guide is useful for building a pre- or post-dinner programme around the first district, where the Haas Haus location makes it easy to walk to several of the city's better cocktail rooms.
ONYX is at Stephansplatz 12, 1010 Wien, in the Haas Haus building directly on the Stephansplatz. The U1 and U3 lines stop at Stephansplatz, making it the most accessible fine dining address in central Vienna. Price range sits at €€€, one tier below the €€€€ venues that dominate Vienna's starred scene, which means a meaningful quality experience without the top-end outlay. Booking difficulty is rated Easy by Pearl, but given the Michelin recognition and the landmark setting, booking at least two to three weeks ahead for weekend evenings is sensible. Weekday lunch or early-week dinner slots are typically more available. For group or private dining enquiries, contact the venue directly as booking method details are not currently listed in Pearl's data.
Quick reference: Stephansplatz 12, 1010 Wien | €€€ | Michelin Plate 2024–2025 | Easy to book | Book 2–3 weeks out for weekends.
Expect a Modern European menu with Asian technique influences, a room with direct views of St. Stephen's Cathedral, and Michelin Plate-level cooking at €€€ prices. It is a better entry point to Vienna's serious dining scene than the €€€€ starred rooms if you want ambition without full tasting-menu commitment. The Google score of 4.1 across more than 1,400 reviews suggests consistent delivery across different types of visits. Book ahead, particularly for weekend evenings.
Smart casual is the safe call for a Michelin Plate restaurant at Stephansplatz. Vienna's fine dining culture skews more formally dressed than, say, London or New York at a comparable level, so erring toward business casual rather than jeans and trainers is the right instinct. No specific dress code is publicly listed, but the setting in the Haas Haus and the price tier make neat, presentable dress the sensible default.
Booking difficulty is rated Easy by Pearl, but that does not mean leaving it to the day before on a Saturday. Two to three weeks ahead is a reasonable lead time for weekend evenings. Weekdays and lunch slots are more forgiving. The Michelin Plate recognition across two consecutive years means demand is real and growing , earlier is always better, especially if you are coordinating a group.
The Modern European and Asian format at ONYX typically gives kitchens enough range to work with dietary requirements, but specific accommodation policies are not listed in Pearl's current data. Contact the venue directly before booking if you have strict requirements. The cuisine type suggests flexibility is more likely here than at a single-format tasting menu restaurant, but confirm in advance rather than assuming.
The Stephansplatz address is one of the easiest in Vienna for groups to reach, with the U1/U3 Stephansplatz stop directly outside. The €€€ pricing makes group dining here more cost-effective than the €€€€ tier venues like Steirereck im Stadtpark or Mraz & Sohn. For private room availability and group menus, contact ONYX directly , seat count and private dining specifics are not currently listed in Pearl's data, so a direct enquiry is the right first step.
| Venue | Cuisine | Price | Booking Difficulty |
|---|---|---|---|
| ONYX | Modern European, Asian | €€€ | Easy |
| Steirereck im Stadtpark | Creative | €€€€ | Unknown |
| Konstantin Filippou | Modern European, Modern Cuisine | €€€€ | Unknown |
| Mraz & Sohn | Modern Austrian, Creative | €€€€ | Unknown |
| Silvio Nickol Gourmet Restaurant | Modern Cuisine | €€€€ | Unknown |
| APRON | Austrian, Creative | €€€€ | Unknown |
How ONYX stacks up against the competition.
ONYX is a Michelin Plate restaurant (2024 and 2025) at Stephansplatz 12, inside the Hans Hollein-designed Haas Haus, with St. Stephen's Cathedral directly outside. Chef Ádám Mészáros runs a Modern European and Asian menu at the €€€ price point — expect a considered, structured meal rather than a casual drop-in. The address is one of the most central in Vienna, which makes it a practical anchor for a serious dining evening. If you want something more neighbourhood-rooted and less landmark-adjacent, Mraz & Sohn in Brigittenau is worth comparing.
The Haas Haus setting and Michelin Plate recognition at the €€€ price range signal that ONYX expects guests to dress appropriately for a formal dinner. There is no dress code confirmed in available venue data, but a Michelin-listed restaurant at this price and address will read underdressed in casual clothing. Treat it as a jacket-appropriate evening — or at minimum, polished business-casual.
No booking window is published, but a Michelin Plate restaurant at Stephansplatz — one of Vienna's highest-footfall addresses — will fill quickly on weekends and during peak tourist season (spring and autumn). Booking at least two to three weeks out is a reasonable baseline; for weekend evenings or larger groups, push that to a month. Walk-in availability at €€€ restaurants in this district is unreliable.
No specific dietary policy is documented for ONYX. At the €€€ level with Michelin recognition, kitchens in this tier routinely accommodate common restrictions when notified at the time of booking — check the venue's official channels at Stephansplatz 12, 1010 Wien to confirm your requirements before arrival.
The Haas Haus location at Stephansplatz 12 is one of the most accessible addresses in Vienna (U1 and U3 lines stop directly outside), which makes coordination for groups straightforward. No private dining room or group booking policy is confirmed in available data, so check the venue's official channels for parties of six or more. For a private dining format with more documented group infrastructure, Silvio Nickol Gourmet Restaurant at the Palais Coburg is worth considering as an alternative.
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