Buckeye can refer to:

• The name used for several species of plants in the genus Aesculus, which see for details, and also the related Mexican Buckeye (genus Ungnadia). A buckeye is often thought to bring good luck.
• Several places in the United States of America:
  • Buckeye, Arizona
  • Buckeye, Colorado
• The American State of Ohio, popularly called the Buckeye State. The college teams of The Ohio State University are known as the Buckeyes.
• A breed of chicken, see buckeye (chicken) .
• The Buckeye , named passenger train operated by the Pennsylvania Railroad between Cleveland, Ohio and Pittsburgh, Pennsylvania.