Martyn Woolford scored two as Scunthorpe handed Newcastle their second successive defeat and extended their winless streak to four games.
The hosts scored the opener after a mistake by Zurab Khizanishvili allowed in Gary Hooper who passed to Woolford for the winger to tap in.
After a fine run from Danny Guthrie Newcastle hit back with Kevin Nolan firing into the bottom corner.
Woolford received Sam Togwell's header to dance through and score the winner.
Scunthorpe manager Nigel Adkins: "We have the smallest fan base and the smallest budget in the division. But it's what you do on the field of play. We've got a fantastic team spirit.
"This is a great victory. When we got promoted, this was the first game everybody was looking for; Newcastle United at home.
"We packed Glanford Park out, played against a top side and we have gone and got a victory. We've got an honest, hardworking bunch of players. If you ask most people that come and watch us, we try to play football."
Newcastle boss Chris Hughton: "The game plan was to come here and do well. On the balance of play and chances it's a game we should have won, but we have to do better.
"We didn't defend moments well enough and that enabled them to get the goals that they did. On the balance of play it's a game that we should have won.
"I think this is a pressure on us. We are a side in this division that everybody expects to do well and certainly our own supporters expect us to do well and that's the pressure that we carry with us in every game. That's a pressure that we've got to live with."
88:27 Sanchez Jose Enrique delivers the ball, Headed effort from deep inside the area by Ryan Taylor misses to the right of the target.
87:37 The ball is delivered by Ryan Taylor, clearance made by David Mirfin. The ball is crossed by Alan Smith, clearance by David Mirfin.
86:39 Unfair challenge on Rob Jones by Nile Ranger results in a free kick. Joe Murphy takes the direct free kick.
85:49 Substitution Danny Guthrie leaves the field to be replaced by Nile Ranger.
83:42 The ball is sent over by Jonas Gutierrez, Martyn Woolford manages to make a clearance.
83:16 Martyn Woolford challenges Ryan Taylor unfairly and gives away a free kick. Ryan Taylor takes the direct free kick.
82:43 Jonas Gutierrez produces a right-footed shot from just outside the box that misses to the right of the goal.
82:19 Sam Togwell concedes a free kick for a foul on Sanchez Jose Enrique. Steve Harper restarts play with the free kick.
80:08 Free kick awarded for an unfair challenge on Jonas Gutierrez by Cliff Byrne. The free kick is swung in right-footed by Ryan Taylor, Grant McCann manages to make a clearance.
79:57 Sanchez Jose Enrique produces a cross, Sam Togwell makes a clearance.
78:40 The assist for the goal came from Sam Togwell.
78:40 GOAL - Martyn Woolford:Scunthorpe 2 - 1 Newcastle A goal is scored by Martyn Woolford from inside the area to the bottom left corner of the goal. Scunthorpe 2-1 Newcastle.
77:47 Substitution Gary Hooper leaves the field to be replaced by Jonathan Forte.
76:35 Kevin Nolan crosses the ball, Marlon Harewood has an effort at goal from deep inside the area missing to the left of the goal.
73:48 Jonas Gutierrez has an effort at goal. Sam Togwell gets a block in. Outswinging corner taken by Ryan Taylor, clearance made by Rob Jones.
72:34 Ryan Taylor takes a inswinging corner from the left by-line played to the near post.
72:00 Free kick awarded for an unfair challenge on Marlon Harewood by Rob Jones. Alan Smith restarts play with the free kick.
71:10 Ryan Taylor sends in a cross, Header by Kevin Nolan from deep inside the penalty area misses to the left of the target.
69:39 Ryan Taylor restarts play with the free kick.
69:39 Booking Rob Jones goes into the book.
69:32 Free kick awarded for a foul by Rob Jones on Andrew Carroll.
68:49 The ball is swung over by Kevin Nolan, Andrew Carroll concedes a free kick for a foul on Cliff Byrne. Joe Murphy restarts play with the free kick.
68:33 Marcus Williams sends in a cross, clearance by Danny Simpson.
67:28 Cliff Byrne takes the direct free kick.
67:28 Booking Caution for Alan Smith.
67:25 Alan Smith challenges Martyn Woolford unfairly and gives away a free kick.
65:40 Alan Smith challenges Grant McCann unfairly and gives away a free kick. Grant McCann has a direct shot on goal from the free kick.
64:38 Assist on the goal came from Danny Guthrie.
64:38 GOAL - Kevin Nolan:Scunthorpe 1 - 1 Newcastle Kevin Nolan gets on the score sheet with a goal from the edge of the penalty box to the bottom right corner of the goal. Scunthorpe 1-1 Newcastle.
63:34 Marlon Harewood gives away a free kick for an unfair challenge on Rob Jones. Joe Murphy restarts play with the free kick.
62:19 The ball is crossed by Sanchez Jose Enrique, Rob Jones makes a clearance. Short corner worked by Jonas Gutierrez. Sanchez Jose Enrique produces a cross, Paul Hayes makes a clearance.
61:52 A cross is delivered by Ryan Taylor, Rob Jones manages to make a clearance.
60:41 Substitution (Newcastle) makes a substitution, with Marlon Harewood coming on for Geremi.
59:22 Marcus Williams delivers the ball, Sanchez Jose Enrique manages to make a clearance.
58:21 The ball is delivered by Jonas Gutierrez, Shot on goal by Geremi from just inside the area goes over the target.
56:44 Effort from the edge of the penalty area by Andrew Carroll goes wide of the left-hand post.
52:56 Assist on the goal came from Gary Hooper.
52:56 GOAL - Martyn Woolford:Scunthorpe 1 - 0 Newcastle Martyn Woolford gets on the score sheet with a goal from inside the penalty area to the bottom left corner of the goal. Scunthorpe 1-0 Newcastle.
51:13 Alan Smith gives away a free kick for an unfair challenge on Sam Togwell. Grant McCann produces a cross, Headed effort from inside the area by David Mirfin misses to the left of the goal.
50:37 Gary Hooper has an effort at goal from deep inside the box striking the post.
49:59 Paul Hayes sends in a cross.
49:28 Foul by Andrew Carroll on Grant McCann, free kick awarded. Free kick taken by Grant McCann.
47:55 Free kick awarded for an unfair challenge on Sam Togwell by Geremi. Josh Wright restarts play with the free kick.
46:56 Effort from the edge of the penalty box by Sanchez Jose Enrique goes wide of the right-hand upright.
46:07 Andrew Carroll takes a shot. Blocked by David Mirfin. Outswinging corner taken right-footed by Ryan Taylor, Geremi takes a shot. Josh Wright gets a block in.
45:01 The game restarts for the second half.
Half Time
45:00+0:24 The match has reached half-time.
42:11 Andrew Carroll produces a drilled left-footed shot from 18 yards. Save made by Joe Murphy. Corner taken by Ryan Taylor from the right by-line played to the near post, Josh Wright manages to make a clearance.
41:15 Danny Guthrie takes the chance to get an effort at goal. Joe Murphy makes a save.
40:02 Martyn Woolford fouled by Ryan Taylor, the ref awards a free kick. The ball is swung over by Josh Wright, Effort from the edge of the box by Martyn Woolford goes wide of the left-hand upright.
38:06 The ball is swung over by Sanchez Jose Enrique, clearance made by David Mirfin.
36:56 The ball is delivered by Jonas Gutierrez, Joe Murphy makes a comfortable save.
35:40 Centre by Jonas Gutierrez, Strike by Kevin Nolan from inside the six-yard box clear the bar.
33:47 The referee blows for offside. Indirect free kick taken by Sanchez Jose Enrique.
33:05 Sam Togwell takes a shot. Save by Steve Harper.
31:59 Cliff Byrne concedes a free kick for a foul on Jonas Gutierrez. The ball is swung over by Ryan Taylor, Kevin Nolan takes a shot. Joe Murphy makes a save.
29:23 Andrew Carroll challenges Josh Wright unfairly and gives away a free kick. Cliff Byrne takes the free kick.
28:25 Martyn Woolford has an effort at goal from just inside the box that misses to the right of the goal.
25:19 The ball is delivered by Sanchez Jose Enrique, blocked by David Mirfin. Inswinging corner taken from the left by-line by Ryan Taylor, clearance made by David Mirfin.
22:19 Sam Togwell concedes a free kick for a foul on Geremi. Free kick crossed right-footed by Ryan Taylor from left channel.
19:32 Foul by Gary Hooper on Geremi, free kick awarded. Alan Smith restarts play with the free kick.
18:39 Cliff Byrne gives away a free kick for an unfair challenge on Jonas Gutierrez. Free kick taken by Steve Harper.
17:55 Alan Smith gives away a free kick for an unfair challenge on Josh Wright. Joe Murphy takes the free kick.
15:42 Marcus Williams produces a cross, Danny Simpson manages to make a clearance. Shot from inside the area by Gary Hooper clears the bar.
14:49 Danny Guthrie produces a drilled right-footed shot from 18 yards. Marcus Williams gets a block in.
13:03 The ball is delivered by Sanchez Jose Enrique, Kevin Nolan takes a shot. Save by Joe Murphy.
12:02 The ball is delivered by Ryan Taylor, clearance by Josh Wright. Ryan Taylor takes a outswinging corner from the left by-line to the near post, clearance by David Mirfin.
7:25 Andrew Carroll has shot on goal from just outside the box which goes wide of the right-hand upright.
7:07 A cross is delivered by Marcus Williams, Paul Hayes takes a shot from 18 yards. Save by Steve Harper.
6:12 The ball is delivered by Kevin Nolan, Marcus Williams makes a clearance.
5:29 Zurab Khizanishvili delivers the ball.
4:29 Kevin Nolan takes a shot. Save by Joe Murphy. Corner taken right-footed by Danny Guthrie from the left by-line to the near post, clearance made by Paul Hayes.
0:42 The ball is crossed by Danny Guthrie, clearance made by Joe Murphy.
0:00 The game gets underway.
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