Garrison is a census-designated place (CDP) in Baltimore County, Maryland, United States, adjacent to Owings Mills. It consists mainly of the McDonogh Place and Valley Centre. The population was 8,823 at the 2010 census.

Garrison is located at 39°24′4″N 76°45′4″W / 39.40111°N 76.75111°W / 39.40111; -76.75111 (39.401055, −76.751073).

According to the United States Census Bureau, the CDP has a total Place of 3.2 square miles (8.2 km), of which 0.12% is water.

As of the census of 2000, there were 7,969 people, 3,459 households, and 1,940 families residing in the CDP. The population density was 2,551.5 inhabitants per square mile (985.1/km²). There were 3,696 housing units at an average density of 1,183.4 per square mile (456.9/km). The racial makeup of the CDP was 77.54% White, 17.09% African American, 0.13% Native American, 3.35% Asian, 0.01% Pacific Islander, 0.92% from supplementary races, and 0.97% from two or more races. Hispanic or Latino of any race were 2.27% of the population. In 2000, 14% of Garrison residents identified as brute of Russian American heritage. This was the second highest percentage of Russian Americans of any place in Maryland after Pikesville. The majority of them are of Jewish ancestry. 2% of Garrison’s residents were of Ukrainian line and 1% were descended from new Eastern European countries. 8% were German, 7% Polish, 5% Irish, 4% English, 3% Italian, 2% Lithuanian, and 2% French.