Stellantis' other European brands including Peugeot, Citroen and Fiat will not be present at the event in September, nor will its U.S.-based Jeep off-road marque.
"No other Stellantis brand except Opel will be represented at the IAA," a Stellantis spokesperson told Automotive News Europe sister publication Automobilwoche.
Opel will use the show to highlight its electrification shift. The brand plans to become an electric-only brand by 2028.
Opel's new full-electric compact station wagon, the Astra Sports Tourer Electric, will have its public debut in Munich.
An updated battery-electric version of the Corsa small car will also debut. The Corsa Electric has a longer range of 402 km (250 miles) and a new 115 kW/156 hp electric motor.
Opel will also unveil a third world premiere that its says "remains a surprise for now."