1912–13 NHA season

The 1912–13 NHA season was the fourth season of the now defunct National Hockey Association. Six teams played 20 games each. The Quebec Bulldogs won the league championship to retain the Stanley Cup. They played and defeated the Sydney Millionaires in a challenge after the regular season.

League business
The Arena Gardens was completed in Toronto and the two dormant NHA franchises started play as the Toronto Blueshirts and the Toronto Tecumsehs. The Arena Gardens hosted a pre-season exhibition match between the Montreal Canadiens and Montreal Wanderers, at which a brawl broke out and Sprague Cleghorn would be charged with assault.

Major Rule Changes
For this season the NHA teams played for the first time with six skaters, abandoning the position of rover. It was agreed that from February onwards, the teams would play with seven. However, after several games at the start of February played with the rover, the decision was made to abandon the rover position permanently.

The Stanley Cup trustees decided prior to this season that all future Stanley Cup challenges would take place after the end of the regular season.

Regular season
In this season, the Ottawa Hockey Club became more commonly known as the 'Ottawa Senators'. The organization remained known as the Ottawa Hockey Association.

Final standings
Note: W = Wins, L = Losses, T = Ties, GF= Goals For, GA = Goals Against

Results
‡ Played with rover (7 man hockey)

Post-season Exhibition series
After the season a series was arranged between Ottawa and Montreal Wanderers and Quebec to play in New York. Ottawa and Montreal played first, with the winner to play-off against Quebec. After the Wanderers defeated Ottawa 10–8 (3–2, 7–6), the Wanderers the two-game series against Quebec 12–10 (9–5, 3–5).

Later in March the Bulldogs went to Victoria to play a series against the Victoria Aristocrats. They lost the best-of-three series two wins to one.

Sydney vs. Quebec
Joe Malone made a try for Frank McGee's record, but fell short at 9 goals. He was not in the lineup for the second game.

Quebec wins series 20–5