Frank Leonard VanderSloot (born August 14, 1948) is an American entrepreneur, radio network owner, rancher, and political campaign financier. He is the founder and former chief executive officer of Melaleuca, Inc. His other business interests include the Riverbend Ranch and Riverbend Communications. VanderSloot also serves on the board of directors and executive board of the U.S. Chamber of Commerce. In 2011, The Land Report listed him as the nation's 92nd largest landowner. In 2017, Forbes listed VanderSloot as the richest person in Idaho and the 302nd wealthiest American with a net worth of $2.7 billion.

VanderSloot served as a national finance co-chair for Mitt Romney's presidential campaigns in 2008 and 2012. He contributed $1.1 million and helped to raise between $2 million and $5 million for Romney's 2012 campaign. He is a significant financial contributor to Republican presidential candidates and Idaho political campaigns. He has also paid for advertising in opposition to several Idaho Democratic political candidates. VanderSloot is the primary financier of the American Heritage Charter School in Idaho Falls.