The A. M. "Mac" Stringfellow Unit (previously Ramsey II Unit) is a Texas Department of Criminal Justice prison located in unincorporated Brazoria County, Texas,[1] with a Rosharon, Texas postal address it is not inside the Rosharon census-designated place.

[2] The prison is located on Farm to Market Road 655, 4 miles (6.4 km) west of Farm to Market Road 521,[3] and about 30 miles (48 km) south of Houston.

[5] In 1963, before racial desegregation occurred, the Ramsey II Unit housed African-American prisoners over the age of 25.

[6] In 2006, the Ramsey II facility was renamed in honor of Alfred McIntyre "Mac" Stringfellow, a former TDCJ board chairman.

[7] The Stringfellow Unit is within the attendance zone of the Alvin Community College.