Ragnar Östberg (14 July 1866 – 5 February 1945) was a Swedish architect who is best known for designing Stockholm City Hall.

In 1893 he visited the World's Columbian Exposition in Chicago and in 1896 he went on a three-year study trip to, among others, England, France, Italy and Greece.

Dating from the early 1900s, he lived and worked in Umeå in northern Sweden.

[3][4] Östberg became the most famous architect within the so-called "national romanticist" movement in Sweden.

His body of work from the period ranges from public buildings, such as Stockholm City Hall,[5] to mansions for influential families at the turn of the century, such as Scharinska villan or Nedre Manilla, built for members of the Bonnier family.