Hotel Cotton House's Gran Via cocktail room — Lazaro Rosa-Violan-designed marble in the 1879 Cotton Producers' Guild building.
Cotton House Bar is the lobby cocktail bar of Hotel Cotton House on Gran Via de les Corts Catalanes in the Eixample — a Marriott Autograph property occupying the 1879 Cotton Producers' Guild building, with interiors by Lazaro Rosa-Violan. The Batthyany Library, the cotton-loom ceiling motifs and the original spiral staircase have all been preserved; the bar runs off the lobby with marble columns, dark wood and a long marble-topped counter. Conde Nast Traveler's Barcelona feature called the interior "the most beautiful hotel bar in the city"; the hotel's own pages confirm the daily 12:00–01:00 schedule.
The right visitor wants a slow stirred drink in a 19th-century library room with proper service, before or after dinner at Batuar (the hotel's restaurant) or on a Gran Via crawl. The wrong visitor wants destination-cocktail programming, a packed room or neighbourhood prices — this is a five-star hotel bar by every measure, and the cocktail list and prices reflect that.
The room is one of the most architecturally striking in Barcelona — marble columns, the preserved 1879 Batthyany Library (now a quiet reading room off the lobby), Lazaro Rosa-Violan's restoration of the Guild interiors, and the original wrought-iron spiral staircase. The bar itself is a long marble counter at the far end of the lobby; in summer the terrace on the third-floor courtyard opens up and the trade shifts there. Conde Nast Traveler describes the lobby as "a Pedralbes manor squeezed onto Gran Via".
The signature list runs stirred-classic-led — a Manhattan with house-made vermut, a Negroni Bianco, a clarified milk punch — with prices €16–20. The wine list leans Catalan with serious Penedès and Priorat depth; glasses from around €9. Conde Nast Traveler's Barcelona feature flagged the gin and tonic programme as "the right order if you want to taste the room".
Bar snacks are short: olives, almonds, a board of cured meat, the day's small plate from the Batuar kitchen. If you want a meal, Batuar is one corner of the lobby away and serves Catalan-Mediterranean for around €60–90 a head. Skip the seasonal cocktail menu if you do not know which way the bartender leans — the Tripadvisor reviews say the classics outperform the rotation.
Before 21:00 the bar is overwhelmingly hotel-guest traffic — Cotton House is an 83-room property and the lobby bar is part of the visit. After 22:00 a Eixample regular crowd in their 30s and 40s fills in, often on a date or a milestone. The Infatuation's Barcelona round-up calls the room "the city's most cinematic hotel bar"; that read survives the visit.