1955–56 Eerste Klasse was a Dutch soccer season of the Eerste Klasse division. It was the first season in which the Eerste Klasse was no longer the senior competition of the Netherlands, as a professional Hoofdklasse had been created just above. The Eerste Klasse continued as professional soccer, also in the 1955–56 season. There were three Eerste Klasse sections: A, B, and C. A and B had 14 teams each, C had 16 teams. Section champions were: * A – RCH Heemstede * B – Hermes DVS * C – Kooger Football Club (now AZ Alkmaar)