Fort Sumner may refer to:

• Fort Sumner, a historic fort in New Mexico
• Fort Sumner, New Mexico, a town near the fort in New Mexico
• Fort Sumner Municipal Airport, an airport for the town in New Mexico
• Fort Sumner (Maryland), a Civil War fort in Bethesda, Maryland near Washington, D.C.
• Fort Sumner (Maine), a former First System fort in Portland, Maine
• Fort Sumner Park, a city park on the site of Fort Sumner, Portland, Maine

• Fort Sumter, a fort in Charleston, South Carolina where the Civil War began