Old Granary in Olsztyn, Historical granary in Olsztyn, Poland.

The Old Granary in Olsztyn is a two-story wooden structure built from larch timber with rectangular windows throughout its facade. The building demonstrates traditional construction methods typical of rural storage facilities from the 18th century.

Built in 1783 for Franciszek Paciorkowski in the Borowno farm complex, the granary later served as a storehouse for the Mykanów agricultural cooperative before falling into neglect. Krzysztof Stacherczak bought it in 1996 and had it dismantled. In 2001 the conservator Aleksander Broda and the owner were arrested on corruption charges over a grant for its relocation. Reassembled in Olsztyn in 2007, it won the Zabytek Zadbany award in 2008.

The granary now houses a restaurant, so its grain-storage past survives as a setting for meals rather than as a working store. The name carved on the west door frame records the founder, Franciszek Paciorkowski, while the construction date is cut into the inner door frame. In 2008 the building won the General Conservator's "Zabytek Zadbany A.D.2008" award for its care.

The granary now houses a restaurant, so the interior is arranged for dining rather than as a museum. Visitors see the structure from outside: the two-story arcaded galleries along the long sides, the tiled gable roof, and the carved door frames. It stands at the foot of Olsztyn Castle, near the town's other sights.

The beam supporting the upper floor is 19.60 m long, hand-hewn from a single tree trunk; the source calls it the longest ever used in wooden construction. The construction date is cut into the frame of the door between the vestibule and the left room, now the Green Hall, while the founder's name is carved on the outer west door frame.