The 1904–05 Federal Amateur Hockey League (FAHL) season lasted from December 31, 1904, until March 3. Teams played an eight-game schedule.
Ottawa Hockey Club, who officially joined the FAHL prior to the end of the last season, played its first full season in the league. Montreal Le National left the league and joined the rival Canadian Amateur Hockey League (CAHL). Ottawa had negotiated with the CAHL to return, along with the Wanderers joining, but this was turned down. Ottawa Capitals also left the FAHL.
The newly transferred Ottawa Hockey Club would win the league championship – and retain the Stanley Cup – with a record of seven wins and one loss.
Ottawa's Frank McGee would score five goals against the Montagnards on February 4.
† Ottawa HC lock down League Championship, retain Stanley Cup.
In January 1905, the Dawson City Nuggets travelled 4,000 miles (6,400 km) from the Yukon to Ottawa for a best-of-three Cup challenge series. The Nuggets actually left Dawson City on December 19, 1904, and travelled on a month-long journey by dog sled (Dawson to Whitehorse), ship (Skagway to Vancouver), and train (Whitehorse to Skagway, and Vancouver to Ottawa). Largely because of the long trip, they were no match for the Silver Seven. Ottawa defeating them in the first game, 9–2. Numerous Stanley Cup records were then set in game two, including Frank McGee's 14 goals, which included eight consecutive goals scored in less than nine minutes, and a 23–2 rout, the largest margin of victory for any challenge game or Stanley Cup Final game to date.
Several players playing for Dawson were from the Ottawa area. Jim Johnstone was from Ottawa. Norman Watt was from Aylmer, Quebec. Randy McLennan had played in a Stanley Cup challenge for Queen's University of Kingston, Ontario. Another player has Stanley Cup challenge experience: Lorne Hanna, "formerly of the Yukon", had played for Brandon Wheat Cities in their 1904 challenge of Ottawa.