The Constanța Military Circle (Cercul Militar Constanța) is a historic public building in Constanța, originally constructed as the Prefecture of Constanța County in the early 20th century.
The building formed part of a new administrative complex created near the old railway station together with the Royal Palace of Constanța and the Palace of Justice. Architect Louis Pierre Blanc prepared the original plans, while Daniel Renard continued and modified the project after Blanc’s death in 1903. Construction of the Prefecture began that same year, and the building was largely complete by 1904. The square in front of the three buildings later also contained the Dobrogea Monument, erected to commemorate the incorporation of Dobrogea into Romania and destroyed during the First World War.
The former Prefecture has an eclectic design with Neo-Romanian decoration, arranged over a basement, raised ground floor, upper floor and attic. Its most prominent feature is the broad ceremonial staircase leading to the arched main entrance, with a balcony above and decorative brickwork continuing across the façade. Inside were the offices of the county administration together with reception rooms and a large hall used for official events.
During the occupation of Constanța in the First World War, the building became the headquarters of the German military command under Field Marshal August von Mackensen, while the neighboring Royal Palace served as his residence. After the war it returned to use as the Prefecture, remaining an administrative building until 1949, when it was transferred to the military and became the Constanța Military Circle.
