The 1902–03 Ottawa Hockey Club season was the club's 18th season of play. The club would win the CAHL championship in a playoff with the Montreal Victorias to win the Club's first Stanley Cup. For their win, the players would each be given a silver nugget. From that day forward, the club was nicknamed the Silver Seven.
This season was the first season for Frank McGee and Art Moore. McGee would place second in the league scoring race with 14 goals in six games.
The season would be a two team race between Montreal Victorias and Ottawa, splitting their matches between each other. The season ended in a tie, which necessitated a two-game playoff, won by Ottawa to win their first Stanley Cup.
Ottawa defeated the Rat Portage Thistles 6–2, 4–2 (10–4) in a two-game, total goals series in Ottawa, March 12–14, 1903.
As the new CAHL and Cup champions, the Ottawas accepted a challenge from the Rat Portage Thistles of the Manitoba & Northwestern Hockey Association (MNWHA). Entering the best-of-three challenge series, the Thistles were younger and quicker than Ottawa; only one player on the Thistles was over the age of 20. However, poor soft ice conditions in Ottawa played a major factor as Ottawa swept the series with scores of 6–2 and 4–2.