Solitary Confinement Study and Reform Act of 2019 This bill establishes the National Solitary Confinement Study and Reform Commission. The commission must study the impact of solitary confinement on governments, communities, and social institutions. It must also report findings and recommend national standards to reduce the use of solitary confinement. The bill directs the Department of Justice to publish national standards to reduce solitary confinement in correctional facilities. The Bureau of Prisons must comply with the national standards immediately. A state or local government must comply with the national standards to receive a full allocation of funds under the Edward Byrne Memorial Justice Assistance Grant program.