1904–05 St Helens RLFC season

season was the club's tenth in the Northern Rugby Football Union, the 31st in the club's sporting history.

A year after gaining promotion back to the first division, ST Helens once again struggled, and finished second-bottom to suffer another relegation.

[1] St Helens also competed in the end-of-season South West Lancashire mini-league, but could only finish fourth out of six.

In the Challenge Cup, St Helens were beaten in the second round by Broughton Red Rose.

[citation needed]