Tage Erlander, Swedish lieutenant and politician, 25th Prime Minister of Sweden (died 1985)

Tage Fritjof Erlander was a Swedish politician and statesman who served as the Prime Minister of Sweden and leader of the Social Democratic Party from 1946 to 1969. Previously, he served as minister of education from 1945 to 1946, and was a member of the Riksdag from 1932 to 1973. During his premiership, Sweden developed into one of the world's most advanced welfare states, with the "Swedish Model" at the peak of its acclaim and notoriety. His uninterrupted tenure of 23 years as head of the government is the longest ever in Sweden and in any modern Western democracy.

The prime minister of Sweden is the head of government of the Kingdom of Sweden. The prime minister and their cabinet exercise executive authority in the Kingdom of Sweden and are subject to the Parliament of Sweden. The prime minister is nominated by the speaker of the Riksdag and is elected by the chamber by simple majority, using negative parliamentarianism. The Riksdag holds elections every four years, in the even year between leap years.