Klas Pontus Arnoldson, Swedish journalist and politician, Nobel Prize laureate (born 1844)

Klas Pontus Arnoldson was a Swedish author, journalist, politician, and committed pacifist who received the Nobel Peace Prize in 1908 with Fredrik Bajer. He was a founding member of the Swedish Peace and Arbitration Society and a Member of Parliament in the second Chamber of 1882–1887.

The Nobel Peace Prize is one of the five Nobel Prizes established by the will of Swedish industrialist, inventor, and armaments manufacturer Alfred Nobel, along with the prizes in Chemistry, Physics, Physiology or Medicine, and Literature. Since March 1901, it has been awarded annually to people who have "done the most or the best work for fraternity between nations, for the abolition or reduction of standing armies and for the holding and promotion of peace congresses." The Oxford Dictionary of Contemporary History describes it as "the most prestigious prize in the world."