is an Australian former professional soccer player who played as an attacking midfielder but also played as a striker on many occasions. A box-to-box midfielder, Cahill became recognised for \"his aggressive and powerful approach and his ability to head the ball in the penalty area\". Cahill has scored 50 goals in 108 caps between 2004 and 2018 and is regarded as one of the greatest Australian Football players of all time. He currently works as a pundit for BBC Sport and Sky Sports.

In 1997, Cahill left Sydney for England to play professionally; there he was signed by Millwall on a free transfer from Sydney United. He was part of the Millwall side that won the Football League Second Division title in the 2000–01 season, and was also a central part of Millwall's run to the 2004 FA Cup Final. Before the start of the 2004–05 season, Cahill was transferred to Everton. He was named both Everton Player of the Season and Everton Players' Player of the Season in his debut season, and in the following year he was named as one of 50 nominees for the Ballon d'Or, becoming the first Everton player in 11 years to be nominated. He was also part of the Everton side that reached the final of the 2008–09 FA Cup. Since leaving Everton in 2012, Cahill has played for the New York Red Bulls, Shanghai Shenhua, Hangzhou Greentown and Melbourne City. After a brief spell at former club Millwall, he ended his career at Jamshedpur.

Cahill was the first Australian to score at a FIFA World Cup, scored in three World Cups (2006, 2010, 2014) and has scored the most goals by any Australian in the men's World Cup with five goals. In 2007, he became the first Australian player to score at an AFC Asian Cup. Cahill is known for his adept heading ability and high vertical leap, having scored many of his goals with his head. He is famous for his regular goal celebration of shadow boxing around the corner flag.