City limits refers to the defined limits of a city's area. Usually such limits are formally described in a state or provincial law (or an appropriate regulation) as being under the control of the municipal corporation or agency that constitutes the city government. It is customary to indicate city limits with the posting of signs on major freeways, highways, and boulevards.

In the United States, property which falls within city limits is subject to city taxation and city regulation, and expects city services. In most states, areas outside of city limits are considered to be unincorporated, and by default they are regulated and taxed by the county.