Old Public Hall of Hakodate Ward, Former public hall in Motomachi, Hakodate, Japan

The Old Public Hall of Hakodate Ward is a two-story wooden giyōfū building completed in 1910 to a design by Asaji Konishi. Its horizontal siding is painted blue-grey with yellow trim, and a central balcony with a yellow balustrade sits beneath a triangular pediment. Inside are a first-floor dining room and billiard room and a second-floor grand hall.

The building was constructed in 1910 after a major fire in 1907 destroyed the previous municipal buildings. It emerged during a time when Hakodate was rebuilding and adopting this newer architectural style for public structures.

The building's name refers to the ward hall of the former Hakodate Ward, built as a public assembly hall after the 1907 fire. Its nickname derives from the blue-gray and yellow paint scheme, which follows a Victorian fashion popular in the late 19th-century United States. Visitors can rent period dresses, tuxedos, arrow-pattern kimono and hakama at the attached Hakodate Haikara Costume House and photograph themselves inside the hall.

The building stands in Motomachi beside Motomachi Park, near the Old British Consulate and the Catholic Motomachi Church. The second floor holds the grand hall, the goza-no-ma and the imperial bedrooms, reached by the corridor linking the porches; the attached single-storey wing connects by a covered passage. A costume rental corner lets visitors wear Meiji-era dress for photographs inside.

The building served as a temporary city hall after the 1934 Hakodate fire destroyed the first municipal office, and from 1951 to 1956 it housed the Hakodate Marine Accident Inquiry Agency, where the inquiry into the 1954 Tōya Maru ferry disaster was held.