Jan Koller is a Czech former professional footballer who played as a striker. He was noted for his height, strong physique, and heading ability.
He began his career at Sparta Prague, then moved to Belgium, where he became the Belgian First Division top scorer with Lokeren. He won the league championship twice with Anderlecht and the Belgian Golden Shoe. In 2001, he joined Borussia Dortmund, where he won the Bundesliga title in his first season and scored 73 goals in 167 official games over five campaigns. He moved frequently in his later career, with stops in France, Germany and Russia.
Koller is the all-time top scorer for the Czech Republic national team, with 55 goals in 91 appearances in a decade-long career starting in 1999. He represented the nation at three UEFA European Championships and the 2006 FIFA World Cup.