The 1924–25Ottawa Senators season was the club's 40th season of play and 8th season in the National Hockey League (NHL). The NHL would expand to 6 teams, as the Montreal Maroons and the first US-based team, the Boston Bruins, joined the league. The NHL also added more games to the schedule, going from 24 to 30. Ottawa would finish in 4th place in the league, failing to make the playoffs for the first time since the 1917–18 NHL season, ending a streak of 6 straight seasons.
The team's ownership changed once again, a year after Ted Dey gave up the business. Frank Ahearn and Tommy Gorman reached an impasse in the management of the team. Both attempted to buy out the other. In December, Ahearn accepted Gorman's $50,000 offer for the club. In January, Gorman's offer was off, after control over all shares was not arranged. However, this may have been used as an escape clause out of the agreement, as Gorman was later to accept a position with the New York Americans. Instead, Ahearn bought out Gorman for $35,000 and Ahearn's share of the Connaught Park Racetrack in Aylmer, Quebec.