Castello Düsseldorf, Multipurpose arena in Reisholz, Germany.

Castello Düsseldorf is a multipurpose hall in Reisholz, built from 2004 and inaugurated in October 2005 with a Magics basketball game and a boxing match. The design by the Rheinfelden office Guida & Mischok followed a competition won for the adjoining Freie Christliche Gymnasium by Franken & Fette of Düsseldorf. Capacity ranges from about 3,000 to nearly 5,000 spectators depending on the event.

The hall was built for the Freie Christliche Gymnasium, founded in 2003, which initially needed only a four-court gym. After nationwide research, the city and sponsors backed a 1,500- to 2,000-seat arena; the Rheinfelden office Guida & Mischok won the second prize and the commission. It opened in October 2005 with a Magics basketball game and a boxing match. The city became owner in August 2010 after the operator club's insolvency.

The arena hosts home games of the SG ART Giants, successor to the Giants Düsseldorf, who moved from Leverkusen in 2008 and played in the Bundesliga until 2013. Since September 2019 Fortuna Düsseldorf's futsal team plays here, and the German futsal national team has appeared for friendlies. The DFB held its three-nation Sportstadt Düsseldorf Futsal Cup here with Sweden and Moldova.

The arena is in Reisholz, in the south of Düsseldorf, and is served by city public transport. Capacity varies by event, from about 3,000 to nearly 5,000 spectators, so seating depends on the configuration. The hall is used mainly for school sport and occasional company events, so check the event calendar before travelling.

The 2005 hall was built for a school gymnasium, but the plans grew when HSG Düsseldorf and Magics Düsseldorf were looking for a suitable venue. The city of Düsseldorf, with support from former mayor Joachim Erwin and the CDU and FDP factions, took over the anchor rents for both clubs. The architects Guida & Mischok from Rheinfelden won second prize in the competition and received the contract for the hall.