1905–06 St Helens RLFC season

season was the club's eleventh in the Northern Rugby Football Union, the 32nd in their history.

After finishing 12th in Division 1 the season previous, St Helens were expected to take part in Division 2 from 1905.

However, the two divisions became one 31-team Championship, saving the club from relegation.

[1] In the South West Lancashire League, St Helens finished fifth in a six-team league.

In the Challenge Cup, the club did not even make the first round proper, as they were defeated by Rochdale in the Preliminary Round.