Agda Viola Rössel, née Jäderström (4 November 1910 – 27 May 2001) was a Swedish politician (Social Democrat) and diplomat. She was appointed Permanent Representative of Sweden to the United Nations in 1958 and was as the first of her gender to have been permanently placed in that position among the 60 UN ambassadors that year in the United Nations organisation; she served in that position till 1964. After this assignment she was Sweden's Ambassador to many countries such as Yugoslavia, Czechoslovakia, and Greece.