Knut () (born December 5, 2006) is a polar bear who was born in captivity at the Zoologischer Garten Berlin. Rejected by his mother at birth, he was subsequently raised by zookeepers. He was the first polar bear cub to survive past infancy at the Berlin Zoo in more than thirty years. At one time the subject of international controversy, he became a popular tourist attraction and commercial success. After the German tabloid newspaper Bild ran a quote from an animal rights activist that seemingly called for the death of the young cub, a worldwide public outrage was caused as fans rallied in support of his being hand-raised by humans. Children protested outside the zoo, and many e-mails and letters expressing sympathy for the cub's life were sent from around the world.

Knut became the center of a mass media phenomenon dubbed "Knutmania" that spanned the globe and quickly spawned numerous toys, media specials, DVDs, and books. Because of this, the cub was largely responsible for a significant increase in revenue, estimated at about five million euros, at the Berlin Zoo in 2007. Zoo attendance figures for the year increased by an estimated 30 percent making it the most profitable year in its 163-year history.