The auction of the 3,000 year old brown quartzite head of the pharaoh is scheduled for July 4
The Egyptian embassy in London requested that Britain prevent the planned sale by Christie's of an ancient sculpture representing King Tutankhamun's head and return it to Egypt, Cairo said.
"The Egyptian embassy in London requested the British foreign affairs ministry and the auction hall to stop the sale," Egypt's foreign ministry said.
Christie's has announced that the brown quartzite head of the pharaoh - measuring 28.5 centimetres high and more than 3,000 years old - would take place on July 4.
It said it expected the sale, from the Resandro Collection - one of the world's "most renowned private collections of Egyptian art" - to fetch more than four million pounds (4.5 million euros, $5.1 million).
The foreign ministry also requested the sale of all Egyptian items planned by Christie's during auctions on July 3 and July 4 be stopped, stressing the importance of securing valid ownership certificates before the sale of these items.
The statement also said the antiquities ministry had requested the UN cultural agency UNESCO stop the sales.