Greig Tonks (born 20 May 1989) is a Scottish rugby union player who plays for London Irish in the position of Fullback, Centre or Fly half.
Born in Pretoria, South Africa, Tonks moved to England aged two. He was educated at Akeley Wood School and Nottingham High School. He played for Newark Rugby club in Nottinghamshire before being signed for Leicester Tigers and has spent long periods on loan at Nottingham Rugby.
In May 2010 it was announced that Tonks had signed for the Northampton Saints. Tonks made his debut for Northampton Saints starting their Heineken cup match against Edinburgh at fullback.
Tonks agreed a move to Edinburgh on 28 February 2012, and made his competitive debut against Munster in the opening game of the 2012–13 Pro12 season.
In March 2015, Tonks signed a new contract with Edinburgh, which would have seen him remain at BT Murrayfield until 2017. However, on 29 February 2016, it was announce that Tonks would leave Edinburgh and join London Irish with immediate effect.
In April 2017, London Irish were crowned Champions of the RFU Championship, with Tonks playing a large role in their title-winning campaign. Tonks signed a new two-year contract with the Exiles as they won promotion back to the Aviva Premiership.
Tonks is eligible to play for Scotland through his Ayrshire born mother. He made his début for Scotland A in a 13–9 victory against the Saxons on 1 February 2013 in Newcastle. The win was notable for being the A side's first ever recorded victory in England.
He made his full international debut for Scotland against Samoa in 2013, starting in the full-back position. He added to his cap collection with three appearances from the replacements' bench during the 2015 Six Nations Championship.
Tonks represented England at under-16 level and took part in the England under-18's tour of Australia. Tonks was a member of the England under-20 squad for the 2008 Six Nations Championship. Tonks also represented England at the 2009 IRB Junior World Championship.