2023 RFL League 1

[1] The number of teams in League One was scheduled to remain at 11, with Keighley and Swinton (who were promoted in 2022), being replaced by Dewsbury Rams and Workington Town, (the teams relegated from the Championship), but on 22 December 2022, the RFL announced that West Wales Raiders had withdrawn from the league, and that the season would proceed with just 10 clubs.

[4] Towards the end of the season, Oldham announced that the club's planned relocation to Boundary Park would be brought forward from 2024.

Off-field the graduated return to play process that applies after a player has suffered a concussion will be a minimum of 12 days (up from 11 in 2022).

Changes have also been made to the disciplinary process where the periods of suspension for the various grade of offences have been reduced but the use of fines increased.

On 24 August, the RFL announced that Rochdale had been awarded the fixture as an automatic 48-0 win under the league's operational rules.