WillGriff John (born 4 December 1992) is a Welsh rugby union player who currently plays for Racing 92 in the Top 14. A tighthead prop, John has previously played for Cardiff Blues, Northland, Doncaster Knights, Sale Sharks, and the Scarlets. He won two caps for Wales in 2021.

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Born in Plymouth, England, and raised in the Rhondda in Wales, John began his playing career at Pontypridd and represented Wales at youth levels. He also played for Cardiff Blues and was part of the squad that won the European Challenge Cup in 2010. In 2013 he moved to New Zealand and played for two seasons in the ITM Cup with the province of Northland.

John then returned to the UK and joined Doncaster in the Championship in 2014.^[2] On 3 May 2017 John was signed by Sale Sharks in the English Premiership.^[3]

John departed Sale to join Scarlets for the 2021–22 season.^[4]

At the end of the 2022–23 season, John was released by the Scarlets, and subsequently joined Racing 92 on a short term contract.^[5]

On 15 January 2020, John was named in the Wales squad for the 2020 Six Nations Championship.^[6] He was named in the starting side against Scotland, but the match was cancelled prior to kickoff due to COVID-19.^[7]

On 6 November 2021, John made his Wales debut coming off the bench against South Africa.^[8] John made his first start against Fiji later in the month.^[9]