Greek National Road 55 (), abbreviated as the EO55, is a national road in northern Greece. The EO55 runs within the Xanthi regional unit, from Xanthi to the border crossing with Bulgaria at the Aegean Pass near : however, the section between Dimario and the border with Bulgaria did not open until January 2026.
The EO55 is officially defined as a northâÂÂsouth road within the Xanthi regional unit: the EO55 branches off the EO14 at near Xanthi, and heads north to the border with Bulgaria near , passing through Echinos. At the border it meets Bulgarian road II-86.
Ministerial Decision G25871 of 9 July 1963 created the EO55 from the old EO47, which existed by royal decree from 1955 until 1963, and followed the same route as the current EO55. The border crossing itself opened on 20 January 2026.