Anne LaBarr Duke is an American former professional poker player and author in cognitive-behavioral decision science and decision education. She holds a World Series of Poker (WSOP) gold bracelet from 2004 and used to be the leading money winner among women in WSOP history, and is still in the top five as of April 2023, despite being retired from poker, last cashing at a tournament 2010. Duke won the 2004 World Series of Poker Tournament of Champions and the National Heads-Up Poker Championship in 2010. She has written a number of instructional books for poker players, including Decide to Play Great Poker and The Middle Zone, and she published her autobiography, How I Raised, Folded, Bluffed, Flirted, Cursed, and Won Millions at the World Series of Poker, in 2005. Duke also authored two books on decision-making, Thinking in Bets: Making Smarter Decisions When You Don't Have All the Facts, and How to Decide: Simple Tools for Making Better Choices.

The World Series of Poker (WSOP) is a series of poker tournaments held annually in Paradise, Nevada and, since 2004, sponsored by Caesars Entertainment. It dates its origins to 1970, when Benny Binion invited seven of the best-known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.