Elna Munch (13 June 1871 – 17 November 1945) was a Danish feminist and politician, (Danish Social Liberal Party). She was the co-founder of the Landsforbundet for Kvinders Valgret (National Association for Women's Suffrage) or LKV (1907), the more radical of the two main Danish suffrage movements, and alongside Johanne Rambusch its leading member. She was the vice chairperson of the LKV from its foundation until its dissolution after the introduction of women suffrage in 1915. She was the organiser of the local sections of the LKV, and represented Denmark at the congresses of the International Woman Suffrage Alliance from 1906 to 1923. In 1918, she became one of the three first women in the Danish parliament, where she sat until 1935.