The flag of Finland (Finnish: Suomen lippu, Swedish: Finlands flagga), also called siniristilippu ("Blue Cross Flag"), dates from the beginning of the 20th century. On a white background, it features a blue Nordic cross, which represents Christianity.

The design of the flag of Finland is inspired by the national flags of Sweden and Denmark. The flag features a sea-blue Scandinavian Cross on the white field with a vertical stripe inclined parallel towards the hoist side. The flag has a proportion of 11:18 with a dimension of 4:3:4 (vertically) and 5:3:10 (horizontally).

National flag consisting of a white field bearing a blue cross; when flown by the government, it incorporates a red, white, and yellow coat of arms featuring a lion. The width-to-length ratio of the flag is 11 to 18.In the 16th century the grand duchy of Finland acquired a coat of arms of its own.

Rather than using red and white, Finland’s flag has a white banner with a blue cross in the Nordic cross style. The national Finnish flag first emerged in 1918, and it represents the country worldwide. Although there are some arguments on where the blue and white colorings come from, many experts say that they shades represent water and snow.