Saudi Arabia, officially known as the Kingdom of Saudi Arabia, (TV: Children of Earth: Day Three) was a country on Earth.
In 1996, representatives of Saudi Arabia negotiated with the Remote for weapons and technology based on the Cold. Shortly afterwards, Saudi special forces soldiers kidnapped the Eighth Doctor from a United Nations facility in Geneva and transported him to Saudi Arabia. He was imprisoned in a cell with Badar and tortured for ten days before being rescued by Sarah Jane Smith. (PROSE: Interference - Book One, Interference - Book Two)
In 2009, the Kingdom of Saudi Arabia was among the nations which agreed to let John Frobisher speak on their behalf to the 456. (TV: Children of Earth: Day Three)