|Born||23 August 1960|
|Major racing wins|
|British Classic Race wins:|
Epsom Oaks (2011)
Epsom Derby (1996)
Other British Champions Series wins:
British Champions Fillies' and Mares' Stakes (2011)
|Shaamit, Dancing Rain, Mukhadram|
He was educated at Harrow and played cricket at Lord's for Harrow against Eton in 1977, 1978 and 1979, captaining the side in the 1979 match. He started his working life in his father's textile factory, but quit after three months and headed to Newmarket. Before taking out a licence in his own right, he learnt his trade with John Winter and Mark Prescott. He trained his first winner in 1987. As of June 2013, he has trained two British Classic winners - Shaamit, winner of the 1996 Derby, and Dancing Rain, winner of the 2011 Oaks. The first of these came when he had just 40 horses in his stable. The second gave him the distinction of having two wins from his first two runners in the Epsom Classics. His third, Vow, came fourth in the 2012 Oaks. Largely thanks to the exploits of Dancing Rain, he finished joint 7th in the 2011 British Champions Series trainers' table.
In early 2013 he was appointed to the roster of Royal trainers. He trained his first winner for the Queen (Elizabeth II), when Purple Spectrum won a maiden race at Windsor on 12 May 2014.
- Derby - (1) - Shaamit (1996)
- Epsom Oaks - (1) - Dancing Rain (2011)
- Cheveley Park Stakes - (1) - Rosdhu Queen (2012)
- Eclipse Stakes - (1) - Mukhadram (2014)
- Racing Post Trophy - (1) - Rivet (2016)
- Yorkshire Oaks - (1) - Sea of Class (2018)
- Prix Maurice de Gheest - (1) - King's Apostle (2009)
- Prix du Moulin - (1) - Aqlaam (2009)
- Prix de la Foret - (1) - One Master (2018)
- "The Stars - Trainers: William Haggas". British Champions Series. Retrieved 23 August 2018.
- "WJ Haggas". cricketarchive.co.uk. Retrieved 7 June 2013.
- "Trainers: William Haggas". Highclere Racing. Retrieved 6 June 2013.
- McGrath, Chris (22 June 2012). "Cardigan fits Coronation profile for William Haggas". The Independent. Retrieved 6 June 2013.
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