COSMO Bar works the cocktail floor of the Cosmopolitan tower on Twarda, a polished Warsaw room where the team behind Bar Wieczorny builds seasonal, Polish-product drinks on a strict zero-waste line.
Published April 28, 2026 · By Daniel Okafor
COSMO Bar sits inside the Cosmopolitan tower at Twarda 4, the cocktail room run by Tomasz Roehr, the bartender behind the acclaimed Bar Wieczorny. Warsaw Insider and Warsaw Foodie both log it as a serious addition to the city scene, a bar that pairs a high-rise address with a strict line on waste.
Who would love it: the drinker who wants a considered cocktail with a clear ethical spine. Who would skip it: anyone after a cheap round, since the drinks here are built and priced as craft.
The room
The bar reads upscale, set within the Cosmopolitan building next to the Odette tea room, a polished room for sipping rather than a loud night out. The seating favours pairs and small groups, which makes it a date room or a refined start to the evening. The bar itself is the focal point, where the team works the seasonal builds in view. The mood is calm and design-led.
What to order
The list is built on seasonal and Polish products, so ask what is current rather than chasing a fixed menu. The zero-waste method is the signature, with citrus offcuts from Bar Wieczorny turned into syrups, cordials and shrubs that show up in the glass here. Beyond cocktails the bar pours craft beers and artisan cider, with snacks to match. Expect central-Warsaw craft pricing, fair for drinks at this level of detail.
The crowd and best time to go
The crowd mixes cocktail enthusiasts, dates and after-work drinkers from the surrounding offices and towers. Early evening is the calm window for a seat at the bar and a proper conversation with the team; later the room fills. Midweek is the quietest version. It suits a slow start or a polished nightcap rather than a marathon.
The detail worth knowing
The sustainability programme is the reason the bar stands out. COSMO leans on seasonal Polish produce, skips citrus shipped from the other side of the world, and uses metal straws over plastic, with the waste-to-syrup pipeline from Bar Wieczorny feeding its cordials. That join-the-dots approach between two of Roehr's bars is the clearest read on the project, craft cocktails with a closed loop behind them rather than a marketing line.
Who it is for
This is for the cocktail lover, the sustainability-minded drinker, and anyone working through Warsaw cocktail bars who wants craft with a conscience. Skip it for a rowdy group night. For the wider city, see the full Warsaw bar guide and our roundup of the best cocktail bars worldwide.
The verdict
COSMO Bar wins on craft and method, a Cosmopolitan-tower cocktail room where seasonal Polish drinks meet a real zero-waste line. Come early, take a seat at the bar, and order whatever the team is proud of. For more of the city's cocktail rooms, compare the Manhattan-leaning El Koktel and the polished pours at Warsaw Cocktail House.
