The 28 year-old striker penned a two year deal earlier tonight after joining from Leyton Orient for an undisclosed fee.
Chief Operating Officer Paul Douglas said to the clubs official website: "We are delighted to have a player of Alex's quality on board and we look forward to seeing him in a Rotherham United shirt."
Revell netted 16 times for the O's last season in League One.
We'll have a full interview with the player tomorrow on MillersMAD.