Emil Hallfredsson is an Icelandic footballer who plays as a central midfielder or left winger for Serie A club Udinese.

Primarily a left sided midfielder, Emil was brought to Tottenham Hotspur by then Sporting Director Frank Arnesen in December 2004, having spent his formative years at FH Hafnarfjardar of the Urvalsdeild in Iceland. Emil became a regular starter for the Tottenham Hotspur Reserves, and played a key part in the Spurs' 2005–06 Premier League Southern Reserve title win. He was then loaned out to Swedish side Malmo FF,. His aim had then been to make the Spurs' first team, but in his remaining months at the club he was not selected for a single game.

In July 2007, he was sold to Lyn, where he was slated to stay until 2010. His first and only 90-minute appearance was against Bodo Glimt in the Norwegian Cup, in which he delivered a fine cross to Dylan Macallister for the 1–0 goal and the win. Three days later, the club surprisingly announced that Emil would be leaving for Italy and Reggina. Emil played his first Serie A match on 26 August 2007 a 1–1 draw with Atalanta. Having not been selected to play for Reggina 1st match of the 2009–10 season at Coppa Italia, he completed a one-year loan to Football League Championship side Barnsley on 14 August 2009. On 31 August 2010 Reggina loaned him to Verona. His first season with Verona he was a regular starter and a decisive player in achieving promotion to Serie B. On 30 January 2016 Emil joined Udinese, signing a contract until June 2018.