Hilde Mangold (20 October 1898 – 4 September 1924) (née Proescholdt) was a German embryologist who was best known for her 1923 dissertation which was the foundation for her mentor, Hans Spemann's, 1935 Nobel Prize in Physiology or Medicine for the discovery of the embryonic organizer,[1] "one of the very few doctoral theses in biology that have directly resulted in the awarding of a Nobel Prize".

It was here that she met and married her husband, Otto Mangold [de], who was Spemann's chief assistant (and, incidentally, a supporter of the Nazi Party).

Shortly after the move, Hilde died from severe burns as a result of a gas heater explosion in her Berlin home.

[6] Mangold performed very delicate transplantation experiments with embryos (a feat even more impressive before the discovery of antibiotics to prevent infection after surgery).

She demonstrated that tissue from the dorsal lip of the blastopore grafted into a host embryo can induce the formation of an extra body axis, creating conjoined twins.