Luise Kähler (12 January 1869 – 22 September 1955) was a German socialist, trade union leader and politician. She was one of a small number of women union officials that held a prominent position within Germany's trade unions in the first half of the twentieth century. She was a member of the Prussian Landtag from 1923 to 1933. She opposed National Socialism and was largely inactive after Hitler came to power in 1933. After World War II, she became a founding member of the Socialist Unity Party of Germany, the ruling party in the German Democratic Republic.