Maryland House of Delegates District 9B is one of the 67 districts that compose the Maryland House of Delegates.

Along with subdistrict 9A, it makes up the 9th district of the Maryland Senate.

District 9B includes part of Howard County, and is represented by one delegate.

[1] As of the 2020 United States census, the district had a population of 46,786, of whom 35,064 (74.9%) were of voting age.

The racial makeup of the district was 23,113 (49.4%) White, 4,768 (10.2%) African American, 118 (0.3%) Native American, 14,835 (31.7%) Asian, 19 (0.0%) Pacific Islander, 912 (1.9%) from some other race, and 3,034 (6.5%) from two or more races.