The 3rd federal electoral district of Zacatecas (Distrito electoral federal 03 de Zacatecas) is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of four such districts currently operating in the state of Zacatecas.

[1] It elects one deputy to the lower house of Congress for each three-year legislative session by means of the first-past-the-post system.

Votes cast in the district also count towards the calculation of proportional representation ("plurinominal") deputies elected from the second region.

[2][3] Under the National Electoral Institute's 2022 districting plan, which will be used for the 2024, 2027 and 2030 federal elections,[4] the 3rd district of Zacatecas covers the northern portion of the state.

Its head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the state capital, the city of Zacatecas.