Christopher Bryan Moneymaker is an American poker player who won the Main Event at the 2003 World Series of Poker (WSOP). His 2003 win is said to have revolutionized poker because he was the first person to become a world champion after qualifying at an online poker site. This has been referred to in the press as the "Moneymaker effect".

Online poker is the game of poker played over the Internet. It has been partly responsible for a huge increase in the number of poker players worldwide. Christiansen Capital Advisors stated online poker revenues grew from $82.7 million in 2001 to $2.4 billion in 2005, while a survey carried out by DrKW and Global Betting and Gaming Consultants asserted online poker revenues in 2004 were at $1.4 billion. In a testimony before the United States Senate regarding Internet Gaming, Grant Eve, a Certified Public Accountant representing the US Accounting Firm Joseph Eve, Certified Public Accountants, estimated that one in every four dollars gambled is gambled online.