Kyle Norval Jonathan Sean Sinckler (born 30 March 1993) is an English professional rugby union player who plays as a prop for Top 14 club Toulon.

Sinckler has represented England at under-16, under-18, under-19 and under-20 levels, and has been a crucial member of the senior team since 2016, in which he has won the Six Nations Championship, the Calcutta Cup and the Millennium Trophy.

[5] Sinckler's performances for England led to him being included in Warren Gatland's squad for the British & Irish Lions' tour to New Zealand in 2017.

[6][dead link‍][7] Sinckler began his Harlequins career when Academy coach Collin Osborne saw him, aged 12, playing at one of his various positions, this time full back, against King's College School OB, Wimbledon, where his talent was immediately spotted.

[20] On 16 October 2020 Sinckler started for the Bears side that defeated Toulon in the final of the EPCR Challenge Cup to win their first ever European trophy.

[29] His form for Harlequins across the 2012–13 and 2013–14 seasons landed Sinckler a place in the England national side for the uncapped annual fixture against the Barbarians.

[34] Sinckler was a member of the side that retained their title during the 2017 Six Nations Championship, missing out on a grand slam with defeat in the last game of the tournament away to Ireland.

[35] During the 2019 Six Nations Championship, Sinckler was referred to by Wales head coach Warren Gatland as an "emotional timebomb", because of some incidents that had occurred during his stint in the 2017 tour to New Zealand with the British & Irish Lions.

[39] The team's excellent form during their campaign saw them qualify for the final against South Africa; in the third minute, Sinckler made accidental contact with teammate Maro Itoje's elbow while attempting to tackle Makazole Mapimpi and was knocked out.

[44][45] On 19 April 2017 Sinckler was included in the list of players selected for the British & Irish Lions tour to New Zealand in June and July.

[48] In July 2017, Sinckler was arrested in Central Auckland, during a night out with his teammates on the conclusion of the British & Irish Lions' tour to New Zealand.