Johan (John) Vilhelm Berg (known as "Father Berg"), born in 1851 in Stockholm, died in 1931 in Stockholm, was a Swedish physician and professor. In the district of Stadshagen on Kungsholmen (Stockholm), John Berg's plan is named after him.

Berg became a student in Uppsala in 1869, where he became a candidate in medicine in 1874. After obtaining his medical licentiate at the Karolinska Institute in 1878 and serving as an assistant during 1878–79, he was appointed as an associate professor of surgery there in 1881 and was promoted to Doctor of Medicine in Uppsala the same year after defending his thesis Studies on the Tongue Cancer and its Treatment.

From 1880 to 1885, he served as an assistant physician at the Orthopaedic Institute. In 1885, he was appointed as an extraordinary professor of surgery at the Karolinska Institute and as senior surgeon at the Serafimer Hospital, and he also held the position of chief physician at the Crown Princess Lovisa's Institution for Sick Children from 1885 to 1892. From 1893 to 1916, he was a full professor of surgery at the Karolinska Institute and senior surgeon at the Serafimer Hospital, as well as head of its economy and administration. From 1914 to 1919, he was a member of the Scientific Council of the Medical Board, from 1917 to 1920 he was the inspector for the institutions for the disabled, and from 1918 to 1919 he was the chairman among experts for the investigation regarding medical education. Berg also energetically advocated for the establishment of a radiology institute and the Radium Home. Annually after his appointment to the professorship, he published Reports from the Royal Serafimer Hospital and became the editor of the surgical section of the Nordic Medical Archive in 1901.

He became a member of the Royal Swedish Academy of Sciences in 1901. He was awarded an honorary doctorate in medicine from the University of Kristiania in 1910, became an honorary member of the Swedish Medical Society in 1911, a member of the Royal Swedish Academy of War Sciences in 1915, and an honorary member of the Medical Society in Copenhagen in 1922.