The 4th Ward is one of the 50 aldermanic wards with representation in the City Council of Chicago, Illinois. It is divided into 52 election precincts. Lake Michigan is the ward's eastern boundary for much of its area. Its northwesternmost point, as of 2002, was located at the intersection of East 26th Street and South Prairie Avenue and its southeasternmost point at the intersection of East 55th Street and Lake Park Avenue.

Sophia D. King is an American politician and former member of Chicago City Council, who served as alderman from the 4th ward, which includes portions of the neighborhoods Bronzeville, Hyde Park, Kenwood, Oakland, and South Loop. King was appointed to the position in 2016 to replace retiring incumbent Will Burns. She won a special election to serve out the rest term of the term in 2017 and was re-elected to a full term in 2019. She was a member and chair of the City Council's Progressive Reform Caucus. King forwent reelection to the city council in 2023 in order to make an unsuccessful run for mayor of Chicago in the 2023 Chicago mayoral election.