The 9th federal electoral district of Baja California () is one of the 300 electoral districts into which Mexico is divided for elections to the federal Chamber of Deputies and one of nine such districts in the state of Baja California.
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 first region.
The 9th district was created by the National Electoral Institute (INE) in its 2023 redistricting process on account of shifting demographics and was first contested in the 2024 general election. The first deputy elected from the district is Hilda Araceli Brown Figueredo of the National Regeneration Movement (Morena).
The 9th district was created in the 2022 redistricting process, which is to be used for the 2024, 2027 and 2030 federal elections. It covers 47 precincts () in the municipality of Tecate, 75 precincts in the municipality of Tijuana and 32 precincts in the municipality of Playas de Rosarito.
The head town (), where results from individual polling stations are gathered together and tallied, is the city of Tecate. The district reported a population of 433,965 in the 2020 Census.