Semir Osmanagić, also known as Sam Osmanagich, is a Bosnian businessman and author. He is best known for promoting his pseudo-archaeological project in central Bosnia related to the so-called "Bosnian pyramids". Osmanagić claims that a cluster of natural hills in central Bosnia and Herzegovina are the largest human-made ancient pyramids on Earth. He has conducted extensive marketing about the site and promoted tourism there.

The Bosnian pyramid claims are pseudoarchaeological theories put forward to explain the formation of a cluster of natural hills in the area of Visoko in central Bosnia and Herzegovina. Since 2005, Semir Osmanagić, a Bosnian-American businessman based in Houston, Texas, has claimed that these hills are the largest human-made ancient pyramids on Earth. His claims have been overwhelmingly refuted by scientists but he has proceeded to promote the area as a tourist attraction.