A coupling device for a fluid cooling system may have a first coupling unit having a first housing, which has a first sub-housing and a second sub-housing connectable to the first sub-housing. The first sub-housing may have a first axial passage opening connectable to a first fluid line, a first signal interface and a first end face. The second sub-housing may have a second axial passage opening connectable to a second fluid line, a second signal interface and a second end face. The first sub-housing and the second sub-housing are axially connectable to one another and the passage openings are fluidically connected to one another and the signal interfaces are connected to one another. The two sub-housings may be laterally connectable to one another, so that in the laterally coupled state, the two sub-housings are arranged parallel next to one another.