The 2017–18 season is Rotherham United's 93rd season in their existence and the first back in League One following relegation last season. Along with competing in League One, the club will also participate in the FA Cup, the EFL Cup and EFL Trophy.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Players with zero appearances have been unused substitutes in one or more games.

On 12 May 2017, Rotherham United announced they will host Sheffield United as part of their pre-season preparations. Four days later, the Millers added Parkgate friendly to the pre-season diary. On 17 May further friendlies at North Ferriby United and Chesterfield were confirmed. A fifth friendly, against Alfreton Town was revealed a day later. Two further friendles, against Gainsborough Trinity and Barnsley were announced on 19 May.

The club announced a two-game training camp in Austria on 6 July 2017. The team will be based at the Sportschule Lindabrunn in Enzesfeld-Lindabrunn where they will face Hungarian side Soproni VSE. They will also play Floridsdorfer AC at the Austrian club's ground.

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