Yes, in many cases it can—but I wouldn’t treat an indoor atrium like a patio. Urban outdoor furniture is often made with powder-coated aluminum, teak, stainless steel, synthetic rattan, and weather-resistant fabrics, so it can handle a covered atrium pretty well. The atrium is protected from direct rain, but it may still get strong sunlight through glass, fluctuating humidity from plants or a water feature, and more dust than a normal room. That means the furniture’s outdoor-rated finish is actually a bonus.
The bigger questions are practical. First, check the fire code. In commercial or multi-residential atriums, furnishings often need to meet flammability or fire-performance standards, and not every outdoor cushion or resin product will have the right documentation. Second, think about drainage and cleaning. Outdoor pieces may have gaps, slatted tops, or drainage holes that let crumbs, water, or plant debris fall through. In an indoor atrium, that can be awkward unless you can clean underneath. Third, watch humidity and condensation. If the atrium has a fountain, lots of plants, or glass walls that sweat, metal frames need good powder coating or stainless steel, and cushions should be able to dry quickly.
Comfort matters too. Outdoor furniture is designed for brief, casual use; indoor atrium seating may need to support longer conversations, reading, or waiting. Add supportive cushions, choose breathable fabrics, and test the seat depth. Also consider acoustics: hard outdoor materials can make a glass-roofed atrium noisy, so rugs, upholstered inserts, and plants can soften the sound. Finally, check weight loads and warranties. A heavy concrete or stone table may be fine on a ground-floor atrium but not on a lightweight raised floor. And some manufacturers will void warranties if outdoor furniture is used in certain indoor environments, especially chlorinated pool atriums.
Aesthetically, it can work beautifully if you edit carefully. A teak bench, powder-coated aluminum chairs, or a sleek outdoor sofa can blur the line between garden and interior. Just avoid pieces that look like they belong beside a barbecue. Keep colors and finishes consistent with the architecture, and use indoor textiles where they won’t be exposed to weather. In short, yes—urban outdoor furniture can be used in an indoor atrium, but only after you check fire ratings, moisture, drainage, comfort, weight, and warranty. Treat it as a design decision, not just a furniture swap.