Rzeszów Cellars, Underground museum in Rzeszów, Poland.

Rzeszów Cellars is a 396-metre underground route beneath the Market Square, linking 40 cellars and corridors on three levels from 0.5 to 10 metres deep. The cellars date from the 14th to the 18th century and lie under the square and the townhouses at nos. 11–14, 19–21 and the former 28 and 29. The route runs from the Town Hall (Rynek 26) to Rynek 12 on Baldachówka Street.

The cellars date to medieval times and are connected to the city's founding in 1354 when Rzeszow received its municipal charter. These underground spaces served residents for centuries as storage areas and shelters, shaping the growth and character of the city above.

The route passes through cellars named after the guilds and families once active in Rzeszów, such as Piwnice Bławatników (the drapers' cellars) and Piwnica Miodowa (the honey cellar). In the Korytarz Herbowy, coats of arms of the city's former owners, of the lands and voivodeships it belonged to, and of Rzeszów itself are displayed.

Visitors should expect uneven stone floors and cool temperatures typical of underground spaces. The entire route can be covered on foot with clear signage making it easy to follow the path.

The narrowest point on the route is Lochy Tatarskie, a passage just 70 cm wide. The route also passes beneath tenement houses at Rynek 11, 12, 13, 14, 19, 20 and 21, as well as the sites of houses 28 and 29, which no longer exist. The cellars lie on three levels between 0.5 and 10 metres below the market square.