Chesterfield were denied a first win in seven games as Luke Waterfall's late header secured a draw for Scunthorpe.
Marc Richards gave the hosts an early lead, firing beyond Sam Slocombe from the edge of the box after Waterfall had failed to deal with a low cross.
After the break Jamie Devitt hit the crossbar with a free-kick and Richards had a header ruled out for offside.
An unchallenged Waterfall equalised two minutes from time when he sent Terry Hawkridge's free-kick past Tommy Lee.
The point moves Chesterfield up to third in League Two while Scunthorpe are two points behind the Spireites in eighth.
VIEWS FROM THE DRESSING ROOM
Scunthorpe United manager Brian Laws told BBC Radio Humberside:
"Particularly after Tuesday we wanted a solid performance to bounce back. If we lose a game we have to make sure we respond.
"There was good movement off the ball, if you put a good ball in we have the strength to attack it.
"It was a very windy day and kicking against the wind, we had no idea where the ball was going to be landing.
"But they worked extremely hard and stuck by the task."
Chesterfield 01 Lee 25 Talbot 15 Humphreys 02 Banks Booked 06 Cooper (Hird - 57' ) 23 Evatt 16 Devitt (Darikwa - 68' ) 12 Ryan 09 Richards 10 O'Shea (Gnanduillet - 78' ) 11 Roberts Substitutes 04 Hird 07 Darikwa 08 Togwell 20 Chapman 21 Gnanduillet 24 Porter 28 McSheffrey Scunthorpe United 01 Slocombe 26 Byrne 03 Dawson 24 Syers 05 Mirfin 15 Waterfall 10 Esajas (Adelakun - 68' ) 04 McAllister 28 Spencer (Iwelumo - 81' ) 29 Winnall 14 Hawkridge Substitutes 02 Ribeiro 09 Iwelumo 13 Severn 16 Adelakun 19 Collins 20 Howe 23 Wootton
Ref: Scott Duncan