Ra is a board game for two to five players designed by Reiner Knizia and themed around Ra, the sun-god of Heliopolis in ancient Egyptian culture. It is one of three auction games designed by Knizia, the others being Medici and Modern Art.

Reiner Knizia is a prolific German-style board game designer. He was born in West Germany in 1957 and earned a doctorate in Mathematics from the University of Ulm before designing games full time. He is frequently included on lists of the greatest game designers of all time. Many of his hundreds of designs are considered modern classics, and many have won or been nominated for significant gaming awards, including the Spiel des Jahres and the Deutscher Spiele Preis. His notable designs include Amun-Re, Blue Moon City, Ingenious, Keltis, Lord of the Rings, Medici, Modern Art, Ra, Taj Mahal, Tigris and Euphrates, and Through the Desert. Many of his designs incorporate mathematical principles, such as his repeated use of auction mechanics.