"Chicago is a city with a great history and it's a great hockey city," the 19-year-old Toews said in a statement. "The Blackhawks are an Original Six team with a great hockey tradition. I'm looking forward to playing for the Chicago Blackhawks fans."
He was Chicago's first pick, third overall, in last June's NHL entry draft.
"Jonathan Toews is an exciting player that Blackhawk fans are going to enjoy watching," Hawks GM Dale Tallon said in a statement. "He has been an outstanding player at the collegiate level for two years, he's won two gold medals playing for Team Canada in the world junior championships the past two years, and was a member of gold medal winning Team Canada in the recently completed world championships in Moscow.
"He has shown leadership and the ability to compete at all levels. We're excited to welcome him to the Blackhawk family."
Toews had seven points (2-5) in nine games for world champion Canada in Moscow.
"I was very impressed by the way he played in the world championships," said Blackhawks head coach Denis Savard. "Jonathan is a heart and soul kid. He looks like he's been very well coached. He is a solid two-way player with lots of skill."
The Winnipeg native had four goals and three assists at the world under-20 championship in Sweden earlier this year, and was named to the tournament's all-star team. He is the first Canadian-born player to ever win a gold medal in both the world junior championship and the world championship in the same year.
Toews also played at the University of North Dakota this season, scoring 18 goals and adding 28 assists in 34 games.