The 3rd federal electoral district of 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 in the state of Zacatecas.
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.
The current member for the district, elected in the 2024 general election, is Ulises MejÃÂa Haro of the National Regeneration Movement (Morena).
Under the 2023 districting plan adopted by the National Electoral Institute (INE), which is to be used for the 2024, 2027 and 2030 federal elections, the 3rd district of Zacatecas covers 430 electoral precincts () across 14 municipalities in the north of the state:
The head town (), where results from individual polling stations are gathered together and tallied, is the state capital, the city of Zacatecas. The district reported a population of 405,879 in the 2020 Census.