The Piers Gaveston Society is a dining club founded in 1977 at the University of Oxford. It is named in honour of Piers Gaveston, favourite and supposed lover of King Edward II of England. In recent years, parties run by the society have been the focus of increased tabloid news coverage.
While some have described it as an extreme club that hosts secret events which include drug use and promiscuous sex, others have said that the society's events – at least during the 1990s – were not as debauched or scandalous as the media portrayed.
Recent news reporting and undercover filming confirmed rumoured activities including widespread drug-taking, sex shows and group sex.
On 21 July 2018 The Sun newspaper reported on the yearly Piers Gaveston summer ball. It wrote that the Piers Gaveston Society transported University of Oxford students by coach to the party's venue, a rented field near Cassington, Oxfordshire.
Aerial photographs showed 'sex tents', a stage from which drugs were dispensed, a live band and bonfire. Witnesses said students watched a live sex show and were dispensed drugs. Some engaged in group sex while others danced and socialised until the party's end, at 6:00am the following morning.
Membership is limited to 10 undergraduates, grouped into 'Masters' and 'Minions'.
To join the Society as a 'Minion' an undergraduate must attend a party before submitting an application and being elected by existing members. In their second year as a member they become Masters, and are paired with a Minion. 
- Nadia Khomami (21 September 2015). "David Cameron and the Piers Gaveston: what we know of Oxford 'secret society'". The Guardian. Retrieved 21 September 2015.
- Slater, Sasha (23 December 2010). "New hedonists beat decadence of my youth". London Evening Standard.
- Pattinson, Robert (21 June 2018). "Hundreds of Oxford University students attended drug-fuelled orgies and 'spanked virgins' in lewd annual bash". The Sun.