Anders Behring Breivik complained in a letter to the prison service that his coffee is served cold, he does not have enough butter for his bread, and he is not allowed moisturiser.
Breivik is serving a minimum 21-year sentence for the bombings and shootings in Oslo and Utoeya island last July.
The Norwegian authorities have not commented on the letter.
However his lawyer has confirmed that the details of the 27-page document leaked to Norway's VG newspaper are authentic.
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I highly doubt that there are worse detention facilities in Norway”
Anders Breivik
Breivik is being held in almost complete isolation - 23 hours a day, he says - at Ila prison outside Oslo.
His cell includes three sections, one to sleep, one for study and a third for exercise - each measuring 8 sq m (86 sq ft).
In the letter, he complains that the cell is poorly decorated and has no view.
"I highly doubt that there are worse detention facilities in Norway," he writes.
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