The 1900Toronto Argonauts season was the club's 15th season of organized league competition since its inception in 1873. The team finished in a first place tie with the Ottawa Rough Riders in the senior series of the Ontario Rugby Football Union with four wins and two losses, but failed to win the league championship after losing to the Riders in the resulting tie-break game in Toronto.
^Results compiled from the Toronto Daily Star on the following dates: Oct. 1, 1900; Oct. 8, 1900; Oct. 15, 1900; Oct. 19, 1900; Oct. 29, 1900; Nov. 5, 1900.