Socialist Left Party, told The Associated Press he handed in his nomination in person on Tuesday,
the last day to put forth candidates.
"I think it is important to raise a debate about freedom of expression and that truth is always the first casualty in war," Valen said. "WikiLeaks wants to make governments accountable for their actions and that contributes to peace."
Valen also announced his choice on his blog, where he wrote that WikiLeaks had advanced the struggle for human rights, democracy and freedom of speech, just like last year's winner, Chinese dissident Liu Xiaobo.