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Kentuckiana, a portmanteau of Kentucky and Indiana, is the area in the Upland South region of the United States containing metropolitan areas with counties in both Kentucky and Indiana. Kentuckiana is primarily the Louisville metropolitan area, including eight counties in Kentucky (Jefferson, Oldham, Bullitt, Meade, Shelby, Trimble, Henry, and Spencer) and five counties in Southern Indiana (Clark, Floyd, Harrison, Scott, and Washington). This area "is regularly referred to as Kentuckiana and also referred to as Indiucky periodically on Indiana's side".
One other area that could lay claim to using the name is the combined metros of Evansville, Indiana and Owensboro, Kentucky, though that region identifies more on its own as "The Tri-State Area" combined. Dearborn, Ohio and Franklin Counties in Indiana make up the western portion of the Cincinnati metropolitan area and make no claims to the Kentuckiana name on their own.
The original meaning of the term Kentuckiana dating back to the 19th century was as a collection of items from or relating to Kentucky. The modern meaning of term as a geographical area was coined by The Louisville Courier-Journal and The Louisville Times sometime during the 1940s. This second definition originally referred to only Jefferson County, Kentucky and Clark and Floyd Counties in Indiana; the geographic center of the Louisville metropolitan area. Since the 1980s the term has expanded to include more counties on both sides of the Ohio River. Today it refers to an indefinitely large region where Kentucky and Indiana meet. Usually centered on Louisville, Kentucky.
- Applegate, Kris (2014) . "Introduction". Legendary Locals of Louisville. Legendary Locals. Arcadia Publishing. p. 8. ISBN 9781467101387. LCCN 2013951017. Retrieved 2018-08-07.
- Buescher, John. "Kentuckiana". teachinghistory.org. TeachingHistory.org. Archived from the original on May 7, 2018. Retrieved August 7, 2018.
- Yater, George H. (2001). "Kentuckiana". In Kleber, John E. The Encyclopedia of Louisville. Lexington, KY: University Press of Kenutcky. p. 459. ISBN 9780813128900. LCCN 99053755. Retrieved 2018-08-07.