The 1890 WAFA season was the 6th season of senior Australian rules football in Perth, Western Australia. The Unions Football Club changed its name to "Fremantle Football Club" in April 1890 to better represent the locality in which they were based. They also won their fourth premiership of a four-peat this season.
In 1890, the WAFA competition consisted of three teams with only two venues, The Esplanade Reserve and Fremantle Oval being used to host matches.
On 20 September 1890 a match was scheduled to be played between Rovers and Metropolitan, however due to a scheduling clash two junior clubs had commenced playing on the ground and the match did not take place.