Maryland's Legislative District 12 is one of 47 districts in the state for the Maryland General Assembly.

[1] As of the 2020 United States census, the district had a population of 130,272, of whom 101,992 (78.3%) were of voting age.

The racial makeup of the district was 69,722 (53.5%) White, 27,474 (21.1%) African American, 571 (0.4%) Native American, 15,056 (11.6%) Asian, 69 (0.1%) Pacific Islander, 6,522 (5.0%) from some other race, and 10,851 (8.3%) from two or more races.

[2][3] Hispanic or Latino of any race were 12,261 (9.4%) of the population.

[5] The district is represented for the 2023–2027 legislative term in the State Senate by Clarence K. Lam (D) and in the House of Delegates by Jessica M. Feldmark (D, District 12A), Terri L. Hill (D, District 12A), and Gary Simmons (D, District 12B).