Bet online on sports & racing with William Hill. Whether you fancy fixed odds or Double Down betting - we got you covered | William Hill Australia. Bet online with William Hill, the top UK bookmaker. We currently have markets available on 43 events across 6 sports - View all our Live In-Play Events. Online betting and gambling at William Hill, the world's biggest bookmaker. Visit us now for sports betting, poker games, online casino, bingo and Vegas games.