Kenneth Alfred Ham (born 20 October 1951) is an Australian Christian fundamentalist, young Earth creationist, apologist and former science teacher, living in the United States. He is the founder, CEO, and former president of Answers in Genesis (AiG), a Christian apologetics organisation that operates the Creation Museum and the Ark Encounter.

Ham advocates biblical literalism, claiming that the creation narrative in the Book of Genesis is historical fact and that the universe and the Earth were created together approximately 6,000 years ago, contrary to the scientific consensus that the Earth is about 4.5 billion years old and the universe is about 13.8 billion years old.

Ham was born 20 October 1951 in Cairns, Queensland. His father, Mervyn, was a Christian educator who served as a school principal in several schools throughout Queensland.

Ham earned a bachelor's degree in applied science (with an emphasis on environmental biology) from the Queensland Institute of Technology and holds a Diploma in Education from the University of Queensland. While at university, he was influenced by John C. Whitcomb and Henry M. Morris's 1961 book The Genesis Flood. Upon graduation in 1975, Ham began teaching science at Dalby State High School in Dalby, Queensland.

In 1977, Ham began teaching at a high school in Brisbane, where he met John Mackay, another teacher who believed in young Earth creationism. According to Susan and William Trollinger, Ham was "appalled by the fact that some of his students assumed their textbooks that taught evolutionary science successfully proved the Bible to be untrue," and he said the experience "put a 'fire in my bones' to do something about the influence that evolutionary thinking was having on students and the public as a whole." In 1979, he resigned his teaching position and, with his wife, founded Creation Science Supplies and Creation Science Educational Media Services, which provided resources for the teaching of creationism in the public schools of Queensland, a practice allowed at the time. In 1980, the Hams and Mackay merged the two organisations with Carl Wieland's Creation Science Association to form the Creation Science Foundation (CSF).

As CSF's work expanded, Ham moved to the United States in January 1987 to engage in speaking tours with another young Earth creationist organisation, the Institute for Creation Research (ICR). His "Back to Genesis" lecture series focused on three major themes – that evolutionary theory had led to cultural decay, that a literal reading of the first eleven chapters of the Book of Genesis contained the true origin of the universe and a pattern for society, and that Christians should engage in a culture war against atheism and humanism. With his popularity growing in the United States, Ham left ICR in 1994 and, with colleagues Mark Looy and Mike Zovath, founded Creation Science Ministries with the assistance of what is now Creation Ministries International (Australia). In 1997, Ham's organisation changed its name to Answers in Genesis.

From the time AiG was founded, Ham planned to open a museum and training centre near its headquarters in Florence, Kentucky, telling an Australian Broadcasting Corporation interviewer in 2007, "Australia's not really the place to build such a facility if you're going to reach the world. Really, America is." In a separate interview with The Sydney Morning Herald's Paul Sheehan, Ham explained, "One of the main reasons [AiG] moved [to Florence] was because we are within one hour's flight of 69 percent of America's population." The 60,000-square-foot (5,600-square-meter) museum, located in Petersburg, Kentucky, four miles (six kilometers) west of the Cincinnati/Northern Kentucky International Airport, opened 27 May 2007.

In February 2018, Ham was disinvited from the University of Central Oklahoma, where he was scheduled to speak, after an LGBTQ student group objected. Later that month, UCO reinvited Ham to speak, and Ham spoke on March 5 as planned.