The football league upheld his claim for wrongful dismissal after he was sent off for a foul on Roman Bednar during their 4-1 win on Tuesday.
Midfielder Henri Lansbury was forced to play the remainder of the game in goal but West Ham still managed a further two goals in the game.
The FA statement read: "West Ham United's goalkeeper Robert Green has had his claim for wrongful dismissal upheld.
"As a result, the one-match suspension handed to him has been withdrawn with immediate effect."
Green will now be available for the Championship leaders' clash with Crystal Palace on Saturday.
Source: DSG
