The Old City Hall is a mid-1850s building in Mobile, Alabama. It is named as such since it was used to house municipal offices upon its completion. However, it was not exactly intended for such purposes as it was designed to become the principal marketplace for selling fresh produce like vegetables as well as meat and fish. This is why it is also commonly known as the Southern Market.

The Old City Hall functioned as a government office building from 1857 after the city hall then burned down. It was a minor alteration to the plan, as to be able to use it to house offices needed the city to expand the original plan, which worked out quite fine.

The Old City Hall still functions as a public building. It currently houses the Museum of Mobile.