Bayer Cross Leverkusen, Electronic signage in Leverkusen, Germany.

The Bayer Cross Leverkusen is the illuminated logo of Bayer AG, consisting of the word BAYER written vertically and horizontally sharing the Y, enclosed in a circle. The current sign, installed in 1958, hangs from two 118-metre steel masts, measures 51 metres in diameter, and weighs 300 tonnes. Its highest point stands 105 metres above ground.

The original cross was built in 1933 between two power plant chimneys and measured about 72 meters tall. It was removed during World War II in 1944 and later replaced with a modern version.

The cross is a landmark that reflects Leverkusen's industrial past and its connection to the Bayer chemical complex. For residents and visitors, it serves as a familiar visual marker that defines the skyline and makes the city recognizable from a distance.

The illuminated sign is best viewed from various points across the city or from a distance. Note that it turns off at night during certain seasons, typically between about 10 PM and 4 AM.

The cross is not the only one of its kind: smaller Bayer crosses stand at other company sites, such as Dormagen. The Leverkusen version remains the largest illuminated advertising sign in the world, with a diameter of 51 metres.