Scott Hogan scored in each half as high-flying Rochdale piled more misery on a Mansfield Town side who have now not won in 13 games.
Hogan put Dale ahead, rising to head in a Graham Cummins cross, and Matthew Lund's close-range shot made it 2-0 after good work by Peter Vincenti.
Ollie Palmer headed a rare Mansfield chance wide before the interval.
But Hogan ended any lingering hopes of a comeback after the break, shooting home after good work by Michael Rose.
Cummins could have added to the lead in the closing stages while Mansfield did not manage a shot on target throughout.
VIEW FROM THE DRESSING ROOM
Rochdale assistant manager Chris Beech told BBC Radio Manchester:
"We asked for that from the players today. We wanted to be disciplined but also expressive and the boys were exactly that.
"It was good to see three goals inside the six-yard box. Crosses flashing across the goal, players really working hard off the ball to make those runs.
"The best thing for us is it hits some rhythm. We're playing, recovering, training, playing. And we've got a rhythm to the next ten days now."
Rochdale 21 Thomson 02 Rafferty 25 Rose 12 Lund 06 Lancashire 22 O'Connell 07 Vincenti 04 Cavanagh 29 Cummins 11 Hogan (Bunney - 83' ) 40 Henderson Substitutes 03 Bennett 05 Eastham 14 Héry 16 Done 23 Collis 24 Allen 39 Bunney Mansfield Town 01 Marriott 28 Westlake 17 Beevers 21 Murray 06 Riley 05 McCombe 19 Clements 13 Howell 15 Dyer (Meikle - 51' Booked ) 24 Andrew 36 Palmer (Daniel - 74' ) Substitutes 02 Sutton 07 Briscoe 10 Stevenson 20 Meikle 22 Deakin 23 McGuire 30 Daniel
Ref: Mark Haywood