Sione Kalamafoni (born 18 May 1988) is a rugby union footballer who plays at number 8 for Leicester Tigers.
Kalamafoni played for Tonga at the 2011 Rugby World Cup.Kalamafoni was born and raised in Tonga, but got a scholarship to go to Auckland Grammar School in New Zealand.Kalamafoni first signed to Nottingham in the RFU Championship from the 2010/11 season.
On 15 March 2012, Kalamafoni would leave Nottingham to sign for Gloucester Rugby in the Aviva Premiership on a two-year contract from 2012/13 season.
On 14 November 2013, Kalamafoni signed a two-year contract extension with Gloucester until the end of 2015/16 season.On 1 June 2017 Leicester Tigers announced that Kalamafoni would be joining them for the 2017-18 season.