The Sports Illustrated Swimsuit Issue is published annually by American magazine Sports Illustrated and features female fashion models, celebrities and athletes wearing swimwear in various locales around the world. The highly coveted cover photograph has been considered as the arbiter of supermodel succession. The issue carries advertising that, in 2005, amounted to US$35 million in value. First published in 1964, it is credited with making the bikini, invented in 1946, a legitimate piece of apparel.

Sports Illustrated (SI) is an American sports magazine first published in August 1954. Founded by Stuart Scheftel, it was the first magazine with a circulation of over one million to win the National Magazine Award for General Excellence twice. It is also known for its annual swimsuit issue, which has been published since 1964, and has spawned other complementary media works and products.