Trump unleashed on Norway hours after the committee awarded this year's prize to Navi Pillay, a former International Criminal Court judge who oversaw a UN report that concluded Israel committed genocide in Gaza.
Trump called Pillay a "mystery person" during a campaign rally in Syracuse, New York. "I never heard of the person. Nobody did."
Each year of his presidency, Trump has expressed disappointment at his failure to win the prize.
"This is an indelible stain on the country of Norway and those people that made such a disgraceful and embarrassing decision," he said.
He listed a number of conflicts that he claimed a role in resolving and said he has helped prevent wars from breaking out between North and South Korea, Japan and North Korea, and China and Taiwan, without providing evidence.
"The Nobel Peace Prize has been forever discredited by a handful of radical ideologues who are anti-democracy and really enemies of civilisation. And we will not forget, Norway," he said.
The president added that he should have received eight Nobel Peace Prizes for his efforts because he claimed to have ended eight ongoing conflicts. He did not make mention of the war in Ukraine, which has raged on through his presidency as his administration has failed to bring the conflict to an end.
