Gylfi Sigurðsson, Icelandic footballer
Gylfi Þór Sigurðsson (Icelandic pronunciation: ​[ˈcɪlvɪ ˈθouːr̥ ˈsɪːɣʏrðsɔn]; transliterated as Gylfi Thor Sigurdsson; born 8 September 1989) is an Icelandic professional footballer who plays as an attacking midfielder for Premier League club Everton and the Iceland national team.

Gylfi began his professional career with Reading in the Championship and in 2010, was sold to 1899 Hoffenheim, which was Reading's biggest sale at the time. He was voted Player of the Season for two consecutive seasons: for Reading in 2009–10 and for Hoffenheim in 2010–11. After a season back in English football with Swansea City, he joined Tottenham Hotspur for a reported £8 million transfer fee. In 2014, he moved back to Swansea as part of an exchange for Ben Davies. In 2017 he transferred to Everton, where he remains.

Gylfi made his senior international debut for Iceland in 2010 and has since earned over 70 caps. He represented Iceland at their first major tournament, UEFA Euro 2016, where his country reached the quarter-finals. He also played at his nation's first ever FIFA World Cup in 2018.