The Hunter Foundation, which is helping Bob Geldof organise the Scottish leg of the event, urged sellers to withdraw the lots immediately and return any profits already made to Live 8.
More than 100 pairs of tickets have already appeared on the site, after the 75,000 people who got lucky in a text message lottery were told they had won yesterday.
Hunter Foundation chief executive Ewan Hunter said: "It is obscene for anyone to profit from Live 8.
"We would urge anyone selling Live8 tickets on eBay, or anywhere else for that matter, to withdraw them immediately.
"If you can't go, return your tickets to Live 8, if you see them being sold, don't bid, we implore you.
"And if you have already sold tickets, return the profits to Live 8.
"There is a deep moral question we should all ask ourselves - Live 8 is about the 30,000 kids that died today, will die tomorrow and the next day.
"Is that something you want to profit from or stop happening?"
Regular eBay vendor Scott Jones, of Ealing, west London, said reselling tickets was against the spirit of Live 8 and called for eBay to halt the auctions.
Cheesed off
"I was really cheesed off when I saw tickets being sold," said Mr Jones, who will be at the concert after his father-in-law won tickets.
"I phoned eBay's head office in California and they really didn't seem to give a monkey's.
"The whole thing is not about making money, it's about raising awareness of what's going on."
More than two million pop fans applied for tickets for the July 2 Hyde Park show to fight African poverty featuring U2, REM, Madonna, Coldplay and Pink Floyd.
Some of the tickets for sale on eBay had attracted what appeared to be hoax bids of up to '10 million.
eBay said it would not stop people reselling tickets, but would make a donation to Live 8 so the site would not profit from the sales.
A spokeswoman said: "The reselling of charity concert tickets is not illegal under UK law, so Live 8 tickets are allowed to be resold on ebay.co.uk.
"As we do not wish to profit from this event, we have offered to make a donation to the Live 8 organisers at least equivalent to the fees we collect from the sale of Live8 tickets.
"We are allowing the tickets because we live in a free market where people can make up their own minds about what they would like to buy and sell.
"A ticket to the Live 8 concert is no different from a prize won in a raffle run by another charity and what the winner chooses to do with it is up to them.
"eBay believes it is a fundamental right for someone to be able to sell something that is theirs whether they paid for it or won it in a competition." Tweet

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I am so disapointed that tickets are "sold out" and people who didn't even plan on attending this event, snagged up all the tickets to sell them online on sites like Ebay. The concert in support of charity is becoming a mockery. I can't go. Tickets were all gone within the hour they went on sale. I would have been thrilled to support this event.
Why should the people who donated money to a charity raffle such as live 8 tickets not be able to sell on their prize?
I choose to support the charity on this and many other occasions, but not for personal gain.
But cannot think of any valid reason why winners should not sell the tickets to those who want to go.
Lord Geldof choose to raffle the tickets so to ensure the reward from the texts (B#1.50 per time?). He could have choosen to auction them to the highest bidders. he could have made more or less.
But then I suppose Sir Bob has never aimed to gain from his charity work over the years.