Andrew Lloyd Webber suggested in a Radio Times interview that black contestants fared worse in the voting.
He added that when he took Jade Ewen to the 2009 contest, he was asked "why have you brought a black artist?"
The European Broadcasting Union, which stages the annual event, said: "We have had no indications of racism".
"On the contrary, we celebrate the differences among different entries, truly uniting Europe for three nights a year."
"At this year's final we had a female black singer representing Ukraine," added the EBU.
"Also, the backing dancer of this year's winner Loreen, was black. Not to mention the French contestant Anggun of Indonesian origin."
Its statement was a direct response to Lord Lloyd-Webber, who criticised this year's competition during his interview.
"I don't think there's any point beating around the bush," said the 64-year-old, "I don't think there was one black face on the programme."
Ewen, who sang It's My Time at the 2009 contest, has a Jamaican mother and Scottish-Sicilian father.
The singer, now a member of the Sugababes, eventually came fifth in the competition. According to Lord Lloyd-Webber, though, she deserved more.
"At the press conference in Moscow, I was asked 'why have you brought a black artist?'" he told the Radio Times.