The Grand Council of Basel-Stadt is the legislature of the canton of Basel-Stadt, in Switzerland. Basel-Stadt has a unicameral legislature. The Grand Council has 100 seats, with members elected every four years. Members of the canton's executive, the Executive Council, are elected on the same day.

Basel-Stadt or Basel-City is one of the 26 cantons forming the Swiss Confederation. It is composed of three municipalities with Basel as the capital. It is traditionally considered a "half-canton", the other half being Basel-Landschaft, its rural counterpart.