David Sigurd Wallin (June 10, 1916 in Nora rural parish in Örebro County, Sweden – May 8, 1999 in , Sweden), was a Swedish artist. He grew up in .
Sigurd Wallin was the son of the Swedish artist David Wallin (1876–1957) and his wife Elin Wallin (1884–1969), born Lundberg, Stockholm. He was the brother of the artist Bianca Wallin (1909–2006). His uncle was the Swedish-American artist Carl E. Wallin (1879–1968). In 1945 he married Margit, born , the couple settled down in , Sweden, and had two daughters.
To find motifs for his oil paintings Sigurd Wallin made annual summer trips, most often to Scania, especially to the neighbourhood of Arild, Mölle and Båstad.
Arild was originally an old fishing village, known as Arildsläge (Arild’s fishing village). On Kullaberg in Arild the artists could benefit from an especially strong summer light that reminded of that of Skagen light, and many Swedish artists were therefore active in Arild and Kullabygden. Mölle is on (Kullen peninsula) at the foot of Kullaberg. From the beginning the function of Mölle was as a fishing village, as was also the function in Arild. Båstad is the largest urban village in the area of (Bjäre peninsula) and it is located at Hallandsåsen with lively summer tourists who put their stamp on the place. Båstad has the largest outdoor facilities for tennis in the Nordic countries. Båstad is also known for its beaches and the resort was once known as a spa and there are still several guesthouses. In this region of Scania Sigurd Wallin found many fine motifs for his oil paintings.