USS John Marshall (SSBN-611) was an Ethan Allen-class submarine, the only ship of the United States Navy to be named for John Marshall (1755–1835), the fourth Chief Justice of the United States. Originally a fleet ballistic missile submarine designated SSBN-611, she later was reclassified as an attack submarine and re-designated SSN-611.

The Ethan Allen class of fleet ballistic missile submarine was an evolutionary development from the George Washington class. The Ethan Allen, together with the George Washington, Lafayette, James Madison, and Benjamin Franklin classes comprised the "41 for Freedom" that were the Navy's main contribution to the nuclear deterrent force through the late 1980s.