The 29-year-old defenseman could have become an unrestricted free agent July 1.
"Chad has exemplified what it means to be a team player the past two years," Penguins general manager Jim Rutherford said. "His work ethic and conditioning have allowed him to jump into the lineup at a moment's notice, which is vital to a team's success."
Ruhwedel had two points (one goal, one assist) in 18 games this season and was scratched from all four games in the Penguins' loss to the New York Islanders in the Eastern Conference First Round of the Stanley Cup Playoffs. He got into six playoff games in 2017, including four against the Ottawa Senators in the Eastern Conference Final, to help the Penguins win the Stanley Cup.
Ruhwedel has 17 points (five goals, 12 assists) in 96 games in three seasons with Pittsburgh. He has 19 points (five goals, 14 assists) in seven NHL seasons (129 games) for the Penguins and Buffalo Sabres.
