Nahki Wells’ first-half strike was enough to earn a vital win for the Londoners.
The Whites had the chance to get back into the game in the second half but Patrick Bamford missed his penalty.
Marcelo Bielsa will be disappointed with the result and he will be demanding a reaction from his players next time out.
It will be interesting to see if Leeds can bounce back from this and put in a strong display.
Leeds are chasing promotion this season and they should be winning these games. Last year, their form dipped during the second half of the season and Bielsa will be looking to avoid a similar slip-up this time.