The Ottawa Senators (Les Sénateurs d'Ottawa) are a professional men's ice hockey team based in Ottawa, Ontario, Canada. They are members of the Northeast Division of the Eastern Conference of the National Hockey League (NHL). The Senators are the most recent Eastern Conference champions, holders of the Prince of Wales Trophy and runners-up in the 2007 Stanley Cup Finals. The Senators play their home games at the 20,500 capacity Scotiabank Place (originally named the 'Palladium', and later the 'Corel Centre').

Founded and established by Ottawa real estate developer Bruce Firestone, the team is the second NHL franchise to have the Ottawa Senators name. The original Ottawa Senators, founded in 1883, had a famed history, winning 11 Stanley Cups and played in the NHL from 1917 until 1934. On December 6, 1990, after a two year public campaign by Firestone to return the NHL to Ottawa, the NHL awarded a new franchise, which began play in the 1992-93 season.

The club has seen its share of struggles, both on and off the ice. The team has had two changes of ownership, from Firestone, to Rod Bryden in 1993 due to the arena development process and its financing, and subsequently to Eugene Melnyk after the team filed for bankruptcy in 2003. On the ice, the club finished last in the league for its first four seasons. Changes in hockey management have led to steady improvement of the team's play, resulting in the team qualifying for the Stanley Cup playoffs each season over the last 10 years. Today, the club is among the most successful teams in the league, consistently finishing high in the standings. The team has several all-star players and one of the league's top lines, the 'CASH' or 'Pizza' line.