Old Indianapolis City Hall, Classical Revival former city hall in downtown Indianapolis, United States

Old Indianapolis City Hall is a four-story brick building clad in Indiana limestone, measuring 188 by 133 feet (57 by 41 m). Built in 1909–1910 in the Classical Revival style, it has a flat roof and a symmetrical facade with regularly spaced windows. It is listed on the National Register of Historic Places.

Old Indianapolis City Hall opened in 1910 and served as the city's seat of government until 1962, when offices moved to the City-County Building. From 1966 to 2001 the building housed the Indiana State Museum, and it was listed on the National Register of Historic Places in 1974. It later served as temporary quarters for the Central Library during its rebuilding.

The building's name changed with its uses: city hall until 1962, then the Indiana State Museum from 1966 to 2001, when exhibits on state and regional history filled its halls. During the rebuilding of the Central Library it served as the temporary Central Library. A 2023 plan to sell it to developer TWG for a 21c Museum Hotel with a public art gallery fell through in April 2026.

The building sits at the corner of Alabama and Ohio Streets in downtown Indianapolis with good access via public transportation. Visitors should allow time to view the stonework and architectural details from different angles, as multiple nearby parking options are available.

The 2023 plan to sell the building and its north parking lot to developer TWG collapsed on April 2, 2026, when the firm failed to sign an agreement. It would have added a 32-story tower with 190 residences, 150 hotel rooms and a 21c Museum Hotel on floors 6 to 13.