Chris Wood fired in a superb late winner to give Leeds their first win of the season at Derby.
The striker drove in from the edge of the box in the 88th minute to win a game that looked set for a draw.
Earlier, Chris Martin's low shot had brought Derby level as the Rams came back strongly after Tom Adeyemi had headed Leeds ahead in the first half.
It is Leeds' first win at Derby in 13 years and inflicts a first defeat of the season on the Rams.
More to follow.