Spiegel21 is an online retailer and manufacturer of made-to-measure mirrors, bathroom furniture and glass products, operated by Ares GmbH in Lünen, Germany. Its range includes illuminated and non-illuminated bathroom mirrors, round and other shaped mirrors, mirror cabinets, TV mirrors, folding mirrors and vanity units. Customers can configure mirrors and cabinets to suit their space, selecting features such as LED lighting, touch controls, clocks, makeup mirrors, shelves, sockets and finishes.

The company also offers shower walls, doors, enclosures and bath screens, along with glass for kitchens, tables and other uses, including toughened and laminated safety glass. Additional products include custom-cut wood panels, bathroom accessories and lighting for mirrors and cabinets. Spiegel21 emphasizes high-quality materials, made-to-measure production and personal advice in Dutch, with telephone support on weekdays.

Its website provides configuration tools, product information, installation guidance and delivery details. Most products ship free, while certain furniture, TV mirrors and shower products incur a transport charge. Customers can contact the company by phone or email for help choosing products