Decatur may refer to a number of places, streets, military establishments, schools, and others mostly named after Stephen Decatur:

• Decatur, Alabama, county seat of Morgan County
  • Decatur metropolitan area, Alabama, the largest metro area with the name Decatur.
• Decatur, Arkansas, a city
• Decatur, Georgia, county seat of DeKalb County
• Decatur, Illinois, county seat of Macon County and largest city with the name Decatur.
  • Lake Decatur, a reservoir in the city
• Decatur, Indiana, county seat of Adams County
• Decatur City, Iowa, a city in Decatur County
• Decatur, Kentucky, an unincorporated community in Russell County
• Decatur, Michigan, a village
• Decatur, Mississippi, county seat of Newton County
• Decatur, Missouri, a ghost town
• Decatur, Nebraska, a village
• Decatur, New York, a town
• Decatur, Ohio, an unincorporated community
• Decatur, Tennessee, county seat of Meigs County
• Decatur, Texas, county seat of Wise County
• Decatur, Washington, an unincorporated community
• Decatur, Wisconsin, a town
• Decatur County (disambiguation)
• Decatur Township (disambiguation)
• Decatur Island, one of the San Juan Islands in Washington state

• Decatur Boulevard, Las Vegas, Nevada, a north–south thoroughfare
• Decatur Highway, U.S. Route 31 in Alabama between Decatur and Birmingham
• Decatur Street (disambiguation)
• Decatur (MARTA station), a railroad station in Decatur, Georgia

• USS Decatur, several ships of the U.S. Navy
• Decatur (1813 ship), an American privateer of the War of 1812
• Fort Decatur, a fort in New York during the War of 1812

• Decatur (name), a list of people with either the surname or given name
• 34351 Decatur, an asteroid
• Decatur High School (disambiguation)
• Arizona Charlie's Decatur, a casino hotel in Las Vegas
• "Decatur Psalm", a song from the 1996 album ATLiens by Outkast
• "Decatur", a song from the 1992 album Headsparks by Seam
• "Decatur, or, Round of Applause for Your Step Mother!", a song from the 2005 album Illinois by Sufjan Stevens

• Decatur Subdivision, a former railroad line in Illinois and Indiana
• All pages with titles containing Decatur

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