Sivar Arnér (13 March 1909 – 13 January 1997) was a Swedish novelist and playwright.^[1]

Sivar Arnér was born at Arby parish in Kalmar County, Sweden. Arnér was the son of the merchant Ernst Arnér and Hilda Nilsson. His brother Gotthard Arnér (1913-2002) was a cathedral organist first at Växjö Cathedral and later at Storkyrkan in Stockholm. His brother Ivar Arnér (1921-1986) was an economist and chief financial officer of Gothenburg Railways.^[2][3]

He attended Lund University where he received his Ph.D. in 1932. He was employed as a teacher at Karlskrona, Skara and Norrköping until 1948. He subsequently settled in Stockholm to become a full-time writer. Among his novels are Plånbok borttappad (1943), Knekt och klerk (1945) and Tvärbalk (1963). Arnér also published a number of dramas including Fem hörspel (1959) and Drottningen (1984). He was awarded the Dobloug Prize in 1971.^[1]

He was married to the Hungarian-born artist and author Lenke Rothman (1929–2008). They were the parents of Elias Arnér (born 1966), noted professor in biochemistry at the Karolinska Institutet.^[4] Sivar Arnér died during 1997 in Stockholm and was buried at Voxtorp Church, Kalmar County.^[1]