William Haggas

William Haggas (born 23 August 1960) is a British Thoroughbred racehorse trainer, based at Somerville Lodge stables in Newmarket, Suffolk. He is the son-in-law of the multiple champion jockey Lester Piggott.

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.

Major wins Great Britain Derby – (1) – Shaamit (1996) Epsom Oaks – (1) – Dancing Rain (2011) Cheveley Park Stakes – (1) – Rosdhu Queen (2012) International Stakes – (1) – Baaeed (2022) Lockinge Stakes – (1) – Baaeed (2022) Eclipse Stakes – (1) – Mukhadram (2014) Racing Post Trophy – (1) – Rivet (2016) Yorkshire Oaks – (1) – Sea of Class (2018) Haydock Sprint Cup - (1) - Montassib (2024) Sussex Stakes – (1) – Baaeed (2022) Champion Stakes – (1) – Addeybb (2020) Queen Elizabeth II Stakes – (1)- Baaeed (2021) Queen Anne Stakes – (1) – Baaeed (2022) Queen Elizabeth II Jubilee Stakes – (1) – Almeraq (2026)

France Prix de Royallieu – (2) – Sea La Rosa (2022), Sea Silk Road (2023) Grand Prix de Saint-Cloud - (1) - Dubai Honour (2024) Prix Maurice de Gheest – (1) – King's Apostle (2009) Prix de la Forêt – (3) – One Master (2018, 2019, 2020) Prix du Moulin de Longchamp – (2) – Aqlaam (2009), Baaeed (2021) Grand Prix de Paris - (1) - Maltese Cross (2026)

Ireland Pretty Polly Stakes – (2) – Chorist (2004), Urban Fox (2018) Irish Champion Stakes - (1) - Economics (2024) Irish Oaks – (1) – Sea of Class (2018) Tattersalls Gold Cup – (1) – Alenquer (2022)

Germany Preis Der Diana – (1) – Dancing Rain (2011)

Italy Gran Criterium – (1) – Count Dubois (2000)

Australia Queen Elizabeth Stakes – (3) – Addeybb (2020, 2021), Dubai Honour (2023) Ranvet Stakes – (2) – Addeybb (2020), Dubai Honour (2023) Golden Eagle - (1) - Lake Forest (2024) Tancred Stakes - (1) - Dubai Honour (2025)