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

Klas Pontus Arnoldson (27 October 1844 – 20 February 1916) 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.