The 1919–20 Ottawa Senators season was the club's 35th season of play and third season in the NHL. It was a very successful season, as they set an NHL record for wins (19), points (38), and won both halves of the season, therefore the Sens automatically were awarded the NHL championship and the right to play in the Stanley Cup Finals. The Senators defeated Seattle to win their eighth Stanley Cup title.

Regular season

The Quebec Bulldogs team was relaunched and added to the league and the schedule changed from 18 games to 24. Also, the Toronto Arenas would get new ownership and be renamed the Toronto St. Pats. Frank Nighbor led the Sens offensively with 26 goals, good for 3rd in the NHL, and his 33 points ranked him 4th. Clint Benedict would set an NHL record with 5 shutouts, and he led the league in both wins (19) and GAA (2.66).

December

Ottawa finished December with a 2-0-0 record, earning four points. The Senators were in first place in the NHL, as second place Toronto also had four points, however, they had played more games by the end of December.

January

February

The Senators finished February with a 7-1-0 record, earning 14 points, and sitting in first place in the second half standings.

March

Overall, Ottawa had a record of 3-1-0 in March. The Senators won the second half of the NHL season as they posted a league best 10-2-0 record, earning 20 points.

Final standings

Record vs. opponents

Schedule and results

Playoffs

Ottawa won both halves of the schedule, and no NHL playoffs were played.

Stanley Cup Finals

The Senators would face the Seattle Metropolitans for the Stanley Cup, with all games scheduled to be played in Ottawa. However an unseasonably warm spring in the Ottawa area led to some problems with the ice at Dey's Arena, and the final two games were moved to Toronto's Arena Gardens, which had artificial ice equipment.

Player statistics

Scoring leaders

Goaltending

Awards and records

Transactions

The Senators were involved in the following transactions during the 1919–20 season.

Trades

Free agents