Buchanan Valley may refer to:
- Buchanan Valley in Adams County, Pennsylvania, USA
- Buchanan Valley Township, Emmons County, North Dakota, in the USA.
- Buchanan Valley, between Gettysburg, Pennsylvania and Chambersburg, in the state of Pennsylvania, USA. It was the site of the kidnap of Mary Jemison in the 18th century.
- Buchanan Valley, an area of Pine Valley in Halfway, Baker City, Idaho, in the USA.