The 22-year-old Bayern Munich midfielder was voted the man of the match in this final and also took the same honor in Germany's 2-2 draw with Ghana in the group stage when he scored his other goal of the tournament. He appeared in six of Germany's seven matches in the tournament, sitting out the 7-1 semifinal rout of host Brazil.
"He comes in and scores, that's what our team is all about," Germany forward Thomas Mueller said of his teammate.
Goetze made his debut for Germany in 2010, when he was 18, making him the country's youngest international since Uwe Seeler in 1954. When Goetze scored against Austria in September 2011, he also became Germany's youngest ever scorer at the time. He has 11 goals in 35 appearances for Germany.
He began his career in Borussia Dortmund before using a clause in his contract to leave for Bayern in 2013.
Goetze won the Bundesliga title twice with Dortmund and once with Bayern, and netted four goals in qualifying for the World Cup.
Under Bayern coach Pep Guardiola, Goetze also usually comes off the bench, although he was brought to the Bundesliga powerhouse as a future star.
"It hasn't been an easy year for me," Goetze said. "I have to thank my family and my closest friends for their support."