Erik Gustaf Bernhard Boström, born 11 February 1842, dead 21 February 1907, was a Swedish landowner and politician. He was a member of the Swedish Parliament between 1876 and 1907. He was the longest-serving Prime Minister of Sweden of the 19th century. He served in that office twice, first from 1891 to 1900. Then he served again from 1902 to 1905. He was also known as E.G. Boström or E. Gust. Boström.