Leeds United conceded twice in the final quarter of the game to go down to a third straight home defeat.
Leeds looked well set to end their poor run as they led through an early Pierre-Michel Lasogga goal but two goals from Derby striker Sam Winnall won the game for the visitors.
Lasogga fired Leeds ahead after just seven minutes when he beat Scott Carson with a low shot from the edge of the area.
Leeds were then denied what looked a stonewall penalty when referee waved away home appeals after Ezgjan Alioski looked to be hauled over by Andre Wisdom.
Lasogga had a great chance to double the lead just before the hour but he could only fire wide of the target from close range.
His miss proved pivotal as Derby grew into the game and they levelled with 18 minutes remaining when Winnall found space in the area to sweep home a Craig Forsyth cross.
Derby then won the game in controversial circumstances with referee Simon Hooper making his second penalty blunder decision of the evening.
Hooper pointed to the spot after Hadi Sacko had fouled Tom Lawrence, with the incident taking place outside of the area.
Winnall stepped up to fire home his second goal of the evening.
Lasogga had a late chance to earn Leeds a point but he blazed over the bar from the edge of the area.
Teams
Leeds United
Lonergan, Ayling, Pennington (Grot 84), Jansson, Dallas, O’Kane, Vieira, Roofe (Sacko 76), Saiz, Lasogga, Alioski (Hernandez 84)
Subs not used
Wiedwald, Shaughnessy, Anita, Klich
Derby County
Carson, Wisdom, Keogh, Davies, Forsyth, Huddlestone, Ledley (Weimann 68), Lawrence, Winnall (Thorne 88), Johnson, Martin
Subs not used
Mitchell, Baird, Pearce, Vydra, Thomas
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