A bookmaker, bookie, or turf accountant is an organization or a person that accepts and pays off bets on sporting and other events at agreed-upon odds.
The first bookmaker, Ogden, stood at Newmarket in 1795.
Bookmakers in many countries focus on accepting bets on professional sports, especially horse racing and association football (soccer). However, a wider range of bets, including on political elections, awards ceremonies such as the Oscars, and novelty bets are accepted by bookmakers in more and more countries.
By "adjusting the odds" in their favour (paying out amounts using odds that are less than what they determined to be the true odds) or by having a point spread, bookmakers aim to guarantee a profit by achieving a 'balanced book', either by getting an equal number of bets for each possible outcome or (when they are offering odds) by getting the amounts wagered on each outcome to reflect the odds. When a large bet comes in, a bookmaker may also try to lay off the risk by buying bets from other bookmakers. Bookmakers do not generally attempt to make money from the bets themselves but rather by acting as market makers and profiting from the event regardless of the outcome. Their working methods are similar to those of an actuary, who does a similar balancing of financial outcomes of events for the assurance and insurance industries.
Depending on the country, bookmaking may be legal or illegal and is often regulated. In the United Kingdom, since 1 May 1961, bookmaking has been legal and has even been a small contributor to the British economy, with a recent explosion of interest with regard to the international gaming sector industry. However, gambling debts were unenforceable under English law until the Gambling Act 2005. Many bookmakers are members of IBAS, an industry organisation used to settle disputes.