Ronald Ernest "Ron" Paul (born August 20 1935) is a Republican United States Congressman from Lake Jackson, Texas, a physician, and a 2008 U.S. presidential candidate.

Originally from the Pittsburgh suburb of Green Tree, Pennsylvania, he studied at Duke University School of Medicine; after his 1961 graduation and a residency in obstetrics and gynecology, he became a U.S. Air Force flight surgeon, serving outside the Vietnam War zone. He later represented Texas districts in the U.S. House of Representatives (1976–1977, 1979–1985, and 1997–present). He entered the 1988 presidential election, running as the Libertarian nominee while remaining a registered Republican, and placed a distant third.

Paul has been described as conservative, Constitutionalist, and libertarian. He advocates a foreign policy of nonintervention, having voted against actions such as the Iraq War Resolution, but in favor of force against terrorists in Afghanistan. He favors withdrawal from the North Atlantic Treaty Organization and the United Nations, citing the dangers of foreign entanglements to national sovereignty. Having pledged never to raise taxes, he has long advocated ending the federal income tax, scaling back government spending, abolishing most federal agencies, and removing military bases and troops from foreign soil; he favors hard money and opposes the Federal Reserve. He also opposes the Patriot Act, the federal War on Drugs, No Child Left Behind, and gun control. Paul is strongly pro-life, and has introduced bills to negate Roe v. Wade, but affirms states' rights to regulate or ban abortion, rather than federal jurisdiction.

While Paul was a leading 2008 presidential candidate in GOP straw polls, he saw substantially less support in landline opinion polls and in various early primaries. On December 16 2007, Paul had the largest one-day Internet fundraiser in U.S. political history, raising over $6 million in 24 hours through an independently organized effort.