Fort Johnson (formerly Fort Polk) is a US military base in Vernon Parish, Louisiana. It may also refer to:

• Fort Johnson (19th century), a historic site in Hancock County, Illinois
• Fort Johnson (South Carolina), a historic site on the northeast point of James Island, South Carolina
• Fort Johnson, New York, a village in Montgomery County
• Fort Johnson Volunteer Fire Company, a fire company in Fort Johnson, New York
• Old Fort Johnson, a historic house in the village of Fort Johnson, New York

This disambiguation page lists articles associated with the title Fort Johnson.
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