The Arlington County Sheriff's Office (ACSO) provides law enforcement services for 207,627 people within 26 square miles (67 km2) of jurisdiction within Arlington County, Virginia.

[1] Unlike the Arlington County Police Department, it is not responsible for patrol or investigations.

[3] In 2016, the office settled with the federal government over alleged violations of the Americans with Disabilities Act of 1990 regarding a deaf prison inmate.

[4] In 2022, after seven men of color had died in the Arlington county jail over the previous seven years, the Arlington branch of the NAACP requested a federal investigation of the county jail.

[6] The facility employs a total of approximately 200 staff members, 160 being Deputy Sheriffs.