Charlotte "Lotti" van der Gaag (Dutch pronunciation: [ɕɑrˈlɔtə ˈlɔti vɑn dər ˈɣaːx]; 18 December 1923 – 19 February 1999) was a Dutch sculptor and painter and strongly associated with members of the COBRA arts movement.

Charlotte van der Gaag was born on 18 December 1923 in The Hague in the Netherlands.

[1] Aged 20, she had a relationship with the artist Bram Bogart, who introduced her to sculpture.

Around 1950, she visited the Dutch poet Simon Vinkenoog in Paris; here she was introduced to members of COBRA, amongst them Karel Appel and Corneille.

Van der Gaag died, at the age of 75, in Nieuwegein on 19 February 1999.