Jeff Rense is an American conspiracy theorist and radio talk-show host of the Jeff Rense Program, broadcast on US satellite radio via Genesis Communications Network (GCN) and Internet radio.  Rense's radio program and website, Rense.com, cover subjects such as 9/11 conspiracy theories, UFO reporting, paranormal phenomena,Zionism, tracking of new diseases and possible resultant pandemics, environmental concerns (see chemtrails), animal rights, possible evidence of advanced ancient technology, geopolitical developments and emergent energy technologies, complementary and alternative medicine among other subjects.

Renses's show has been noted as being among "conspiracy-oriented Internet radio shows that often feature anti-Semites and extremists" by theAnti-Defamation League, a non-profit organisation that opposes anti-semitism.

Rense was born in St. Louis, Missouri and grew up in Southern California. Rense worked as a television news reporter, producer and anchor for Santa Barbara's ABC affiliate, KEYT-TV. He performed the same duties for two TV stations in the Northwest in the early to mid-1980s, chiefly Oregon NBCaffiliate KOBI-TV, where he spent several years. He left the business after jobs in Oregon and at a Las Vegas, Nevada television station where he was "#1 rated Oregon TV news anchor."